CN112744158A

CN112744158A - Display system

Info

Publication number: CN112744158A
Application number: CN202011151810.9A
Authority: CN
Inventors: 今村典广; 永富谦司; 星田裕文; 山形道弘; 松崎圭一; 宋昇司
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Automotive Electronic Systems Co ltd
Priority date: 2019-10-30
Filing date: 2020-10-26
Publication date: 2021-05-04
Also published as: US11235706B2; DE102020128073A1; US20210129755A1; DE102020128073B4

Abstract

Provided is a display system capable of displaying an image more appropriately, wherein the display system (100) is provided with: a display (103) that emits outgoing light (131) corresponding to image information; a half mirror (113) to which outgoing light (131) enters, the half mirror reflecting a1 st component of the incident light as reflected light (132) and transmitting a2 nd component; and a1 st mirror (111) that reflects the reflected light (132) toward the half mirror (113), wherein the half mirror (113) is formed by laminating a1 st phase difference film (121), a1 st support substrate (122), and a reflective polarizing film (123) in this order from the incident side of the outgoing light (131).

Description

Display system

Technical Field

The present disclosure relates to a display system for displaying image information.

Background

As an example of a conventional display system, patent document 1, for example, discloses an image display device that is assumed to be mounted on a head mounted display or the like, and that is capable of maintaining high brightness and high image quality while achieving downsizing and weight reduction of an optical system.

(Prior art document)

(patent document)

Patent document 1: japanese laid-open patent publication No. 11-237584

Patent document 2: specification of U.S. Pat. No. 5706144

Patent document 3: japanese patent laid-open publication No. 2017-210229

However, the display system such as the image display device disclosed in patent document 1 may not be able to display an image appropriately.

Disclosure of Invention

Thus, the present disclosure provides a display system capable of displaying an image more appropriately.

A display system according to an aspect of the present disclosure includes: a display configured to emit light corresponding to image information from a display surface; a half mirror to which the outgoing light is incident, the half mirror reflecting a1 st component of the incident light as reflected light and transmitting a2 nd component different from the 1 st component; and a1 st reflecting mirror having a concave surface, wherein incident light is reflected on the concave surface, and the reflected light is reflected on the half reflecting mirror, wherein the half reflecting mirror is configured such that a1 st phase difference film, a1 st support substrate, and a reflective polarizing film are laminated in this order from an incident side of the emitted light, the 1 st phase difference film changes a phase of the incident light, the 1 st support substrate has a light transmitting property, and the reflective polarizing film reflects a1 st polarized light component and transmits a2 nd polarized light component different from the 1 st polarized light component.

With the display system of the present disclosure, images can be displayed more appropriately.

Drawings

Fig. 1 is a diagram showing an example of an interior of a vehicle provided with a display system.

Fig. 2A is a diagram 1 showing a use example of the display system.

Fig. 2B is a diagram 2 showing an example of use of the display system.

Fig. 3 is a diagram illustrating an image displayed by a conventional display system.

Fig. 4 is a block diagram showing a functional configuration of the display system according to embodiment 1.

Fig. 5 is a diagram illustrating an optical system of the display system according to embodiment 1.

Fig. 6A is a diagram illustrating components constituting reflected light in a conventional display system.

Fig. 6B is a diagram illustrating components constituting reflected light in the display system according to embodiment 1.

Fig. 7 is a diagram illustrating an image displayed by the display system according to embodiment 1.

Fig. 8 is a diagram illustrating an optical system of a display system according to modification 1 of embodiment 1.

Fig. 9A is a view 1 illustrating a half mirror of a display system according to modification 2 of embodiment 1.

Fig. 9B is a diagram 2 illustrating a half mirror of a display system according to modification 2 of embodiment 1.

Fig. 10 is a diagram illustrating a half mirror of a display system according to modification 3 of embodiment 1.

Fig. 11 is a schematic configuration diagram showing a display system according to embodiment 2.

Fig. 12 is a schematic explanatory view of a mobile body provided with the display system according to embodiment 2.

Fig. 13 is an explanatory diagram of a use state of the display system according to embodiment 2.

Fig. 14 is a front view of a display system according to example 1 of modification 1 of embodiment 2.

Fig. 15 is a front view of a display system according to example 2 of modification 1 of embodiment 2.

Fig. 16 is a front view of a display system according to example 3 of modification 1 of embodiment 2.

Fig. 17 is a front view of a display system according to example 4 of modification 1 of embodiment 2.

Fig. 18 is a front view of a display system according to example 5 of modification 1 of embodiment 2.

Fig. 19 is a schematic configuration diagram of a display system according to modification 2 of embodiment 2.

Fig. 20 is a schematic configuration diagram of a display system according to example 1 of modification 3 of embodiment 2.

Fig. 21 is a front view of a display system according to example 1 of modification 3 of embodiment 2.

Fig. 22 is a front view of a display system according to example 2 of modification 3 of embodiment 2.

Fig. 23 is a front view of a display system according to example 3 of modification 3 of embodiment 2.

Fig. 24 is a front view of a display system according to example 4 of modification 3 of embodiment 2.

Fig. 25 is a front view of a display system according to example 5 of modification 3 of embodiment 2.

Fig. 26 is a schematic configuration diagram of a display system according to modification 4 of embodiment 2.

Fig. 27A is a schematic configuration diagram of a display system according to example 1 of modification 5 of embodiment 2.

Fig. 27B is a schematic configuration diagram of a display system according to example 2 of modification 5 of embodiment 2.

Fig. 28 is a schematic explanatory view showing a case where the mirror member is located at the 1 st position in the display system according to modification 6 of embodiment 2.

Fig. 29 is a schematic explanatory view showing a case where the mirror member is located at a position between the 1 st position and the 2 nd position in the display system according to modification 6 of embodiment 2.

Fig. 30 is a schematic explanatory view showing a case where the mirror member is located at the 2 nd position in the display system according to modification 6 of embodiment 2.

Fig. 31 is an explanatory view of the vehicle interior.

Fig. 32A is a diagram showing an example of an image from the imaging unit.

Fig. 32B is a diagram showing an image of an interior including a window pillar at the rear of a rear seat of the vehicle.

Fig. 32C is a diagram showing an example of an image in which an image of an interior is superimposed on an image from the imaging unit.

Fig. 33 is a schematic configuration diagram showing a display system according to embodiment 3.

Fig. 34 is a schematic explanatory view of a mobile unit including the display system according to embodiment 3.

Fig. 35 is an explanatory diagram of an interior pattern in the display system according to embodiment 3.

Fig. 36A is a diagram showing an image of a display surface in the display system according to embodiment 3.

Fig. 36B is a view showing a display surface image and an interior pattern superimposed on each other in the display system according to embodiment 3.

Fig. 37 is a schematic configuration diagram of a display system according to example 1 of modification 1 of embodiment 3.

Fig. 38A is a diagram showing an image of a display surface in the display system according to example 1 of modification 1 of embodiment 3.

Fig. 38B is a diagram showing a display of the interior display unit in the display system according to example 1 of modification 1 of embodiment 3.

Fig. 38C is a view showing a display surface image and an interior pattern superimposed on each other in the display system described above.

Fig. 39 is a view showing a display system according to example 2 of modification 1 of embodiment 3 in which an image of a display surface is displayed in superimposition with an interior pattern.

Fig. 40 is a view showing a display system according to example 3 of modification 1 of embodiment 3 in which an image of a display surface is displayed in superimposition with an interior pattern.

Fig. 41 is a schematic configuration diagram of a display system according to modification 2 of embodiment 3.

Detailed Description

(pass through to reach this disclosure)

The following describes in detail the problems of the display system disclosed in patent document 1 and the like, while showing an example of use of the display system of the present disclosure, with reference to fig. 1 to 3.

Fig. 1 is a diagram showing an example of a vehicle interior provided with a display system. Fig. 1 shows an example in which the interior mirror of a vehicle 300 is replaced with a high-vision electronic mirror as an example in which the display system 100 of the present disclosure and a conventional display system are provided. Note that, with respect to the conventional display system, the description will be made by replacing the display system 100 with the conventional display system as appropriate. As shown in fig. 1, a high-vision electronic mirror that can be replaced with an interior mirror of a vehicle 300 is configured by a display system 100 as an example.

The display system 100 is disposed at the same position as the interior mirror, and the display system 100 is disposed at a position above a windshield (front window) when viewed by a driver of the vehicle 300, for example. The display system 100 provided at this position displays the rear of the vehicle 300 as an image, as in the case of the interior mirror. Unlike the interior mirror, the display system 100 can display an arbitrary image, and can display various information such as a vehicle speed, a detection result of an approaching object, and navigation information from a current location to a destination as an image. The image is projected onto the line of sight of the driver via an output window 101 provided on the surface of a housing 105 (see fig. 5 described later) of the display system 100. In other words, the driver can visually confirm the above information by looking at the output window 101.

Fig. 2A is a diagram 1 showing a use example of the display system. Fig. 2B is a diagram 2 showing an example of use of the display system. Fig. 2A shows a situation behind the vehicle 300 as an example of an image 101a displayed on the display system as viewed from the driver. By looking at the output window 101 of the display system 100 in this way, the driver can visually confirm the projected image 101 a. In this example, the displayed image 101a is an image captured by the imaging device 200 provided in the vehicle 300. As shown in fig. 2B, the imaging device 200 is provided behind the vehicle 300, and images the situation behind the vehicle 300, such as a dotted portion. The captured image is sent to the display system 100 to be displayed substantially in real time as image 101 a.

In the conventional display system, an image 101a as shown in fig. 3 may be displayed. Fig. 3 is a diagram illustrating an image displayed by a conventional display system. In the image shown in fig. 3, a state where no pattern such as a pattern is present is shown. As shown in fig. 3, in the conventional display system, a coloring phenomenon of a speckle fluctuation occurs in different colors depending on the viewing direction. When the coloring phenomenon occurs in this way, there arises a problem that the image 101a to be originally displayed is affected and blurred, and the visibility is deteriorated. That is, in the conventional display system, an image may not be displayed appropriately.

The coloring phenomenon of the wavy stripes of different colors, which appear depending on the direction of viewing, shown in fig. 3 can be seen as an oil film spreading on the water surface. This phenomenon occurs because of interference between 2 kinds of reflected lights reflected at the water surface and the oil film surface when external light is received. Specifically, there are two types of light, one of which is light that is reflected by external light passing through the oil film and reaching the water surface, and the other of which is light that is reflected by the surface of the oil film without reaching the water surface. Since the thicknesses of the water surface and the oil film surface are not constant, the wavelengths of light interfering with each other differ depending on the position or direction of the user. In the conventional display system, there is a possibility that a phenomenon based on the same principle as described above may occur.

More specifically, in the conventional display system, light corresponding to image information is emitted from the display, and then reflected multiple times inside the display system and reflected to the output window, but in this case, the structure for reflecting the light includes a half mirror, and the above-described problem occurs in the reflection by the half mirror.

(summary of the present disclosure)

In view of the above, a display system according to an aspect of the present disclosure includes: a display configured to emit light corresponding to image information from a display surface; a half mirror to which the outgoing light is incident, the half mirror reflecting a1 st component of the incident light as reflected light and transmitting a2 nd component different from the 1 st component; and a1 st reflecting mirror having a concave surface, wherein incident light is reflected on the concave surface, and the reflected light is reflected on the half reflecting mirror, wherein the half reflecting mirror is configured such that a1 st phase difference film, a1 st support substrate, and a reflective polarizing film are laminated in this order from an incident side of the emitted light, the 1 st phase difference film changes a phase of the incident light, the 1 st support substrate has a light transmitting property, and the reflective polarizing film reflects a1 st polarized light component and transmits a2 nd polarized light component different from the 1 st polarized light component.

In such a display system, light emitted as light corresponding to image information is incident on the half mirror. The light incident on the half mirror is divided into the 1 st component that is reflected and the 2 nd component that is transmitted, and at this time, the 1 st retardation film, the reflective polarizing film, and the boundary surface of the bonding layer bonding these to the 1 st support substrate, which constitute the half mirror, are reflected as expected. The display system of the present disclosure is configured to reduce the unintended reflection.

Specifically, when uneven undulations are generated on the boundary surface, the incident light is easily reflected, and different lights reflected on different boundary surfaces interfere with each other, thereby causing the coloring phenomenon described above. Accordingly, by maintaining the flatness of the boundary surface, it is possible to suppress the reflection which is not expected, and further suppress the coloring phenomenon. In the display system of the present disclosure, the 1 st retardation film and the reflective polarizing film, which are likely to form an uneven boundary surface, are disposed on both surfaces of the 1 st support substrate having a relatively high flatness, so that the occurrence of an uneven boundary surface can be suppressed (in other words, flatness can be ensured) compared to a conventional display system in which both the 1 st retardation film and the reflective polarizing film are stacked. Therefore, the display system can suppress an unexpected reflection and suppress a coloring phenomenon due to the reflection. Thus, an image can be displayed more appropriately.

For example, the 1 st retardation film may be directly attached to one main surface of the 1 st support substrate, and the reflective polarizing film may be directly attached to the other main surface of the 1 st support substrate.

As described above, since no other member is present between the 1 st retardation film and the 1 st support substrate, the effect of ensuring the flatness of the 1 st retardation film by the 1 st support substrate can be improved. Meanwhile, there is no other member between the reflective polarizing film and the 1 st support substrate, so that the effect of ensuring the flatness of the reflective polarizing film by the 1 st support substrate can be improved. Therefore, formation of an uneven surface can be suppressed, and an image can be displayed more appropriately. Further, since such an effect can be achieved by 1 sheet of the 1 st support substrate, it is possible to suppress an increase in size of the display system in order to ensure flatness of each component of the half mirror.

Further, for example, the half mirror may further include a2 nd retardation film, the 2 nd retardation film being laminated on a surface of the reflective polarizing film opposite to the 1 st support substrate, and the 2 nd retardation film may change a phase of the light of the 2 nd polarization component transmitted through the reflective polarizing film.

As described above, the image of the display system can be displayed by the output of the circularly polarized light. Even if an optical device having a polarizing property such as a polarizing plate or a polarizing film is present between a display system and a user (for example, a driver) who visually recognizes an image by the display system, the user can visually recognize the image well. Thus, an image can be displayed more appropriately.

Further, for example, the half mirror may further have a2 nd support substrate, the 2 nd support substrate being laminated on a surface of the reflective polarizing film on a side opposite to the 1 st support substrate and having light transmittance.

With this, the flatness of the reflective polarizing film sandwiched between the 1 st support substrate and the 2 nd support substrate can be ensured. The formation of uneven surfaces on both main surfaces of the reflective polarizing film can be suppressed, and an image can be displayed more appropriately.

Further, for example, the half mirror may further include a3 rd supporting substrate, and the 3 rd supporting substrate may be laminated on a surface of the 1 st retardation film on a side opposite to the 1 st supporting substrate, and may have a light-transmitting property.

With this, the flatness of the 1 st retardation film sandwiched between the 1 st support substrate and the 3 rd support substrate can be ensured. Formation of uneven surfaces on both main surfaces of the 1 st retardation film can be suppressed, and an image can be displayed more appropriately.

For example, the display system may further include a2 nd mirror, and the 2 nd mirror may be different from the 1 st mirror.

With this, the degree of freedom in designing the optical path of light emitted from the display of the display system via the half mirror can be improved. In addition, the shape of the housing that determines the outer shape of the display system can be freely designed. Accordingly, the image can be displayed more appropriately so as to be suitable for the use of the display system.

Further, for example, the 2 nd mirror may reflect the outgoing light toward the half mirror.

As a result, the outgoing light reflected by the 2 nd mirror disposed between the display and the half mirror enters the half mirror. The degree of freedom in designing the optical path of light can be improved even in a space or the like where a shield or the like exists between the display and the half mirror. Accordingly, the image can be displayed more appropriately so as to be suitable for the use of the display system.

For example, the 2 nd mirror may reflect the reflected light toward the 1 st mirror.

As a result, the reflected light reflected by the 2 nd mirror disposed between the half mirror and the 1 st mirror enters the 1 st mirror. Even in a space or the like where a shield or the like exists between the half mirror and the 1 st mirror, the degree of freedom in designing the optical path of light can be improved. Accordingly, the image can be displayed more appropriately so as to be suitable for the use of the display system.

Further, for example, the image information may be information showing an image captured by an image capturing apparatus.

As described above, the captured image can be displayed using the display system. For example, the display system can be used as an electronic mirror as long as it is configured to display a captured image in substantially real time.

Further, for example, the display may have: a light feeder which feeds light corresponding to the image information as linearly polarized light; and a3 rd retardation film for changing the phase of the linearly polarized light supplied from the light supplier and emitting the changed phase as the emitted light.

As described above, the display system can be configured by using all the light feeders capable of feeding linearly polarized light. As the light supplier in the display system, for example, an LCD, an organic electroluminescence display, or the like can be used. In the case of an organic electroluminescence display, the display may be combined with a polarizing plate or the like for converting supplied light into linearly polarized light.

The embodiments described below are specific examples of the present disclosure. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, and the order of the steps, which are described in the following embodiments, are merely examples, and the present disclosure is not limited thereto. Among the components in the following embodiments, components that are not described in the technical means illustrating the highest concept will be described as arbitrary components.

(embodiment mode 1)

[ constitution and operation of display System ]

The configuration and operation of the display system 100 according to the embodiment will be described below with reference to fig. 4 to 7. Fig. 4 is a block diagram showing a functional configuration of a display system according to an embodiment.

As shown in fig. 4, the display system 100 according to the present embodiment includes: an output window 101, an obtaining unit 102, a display 103, and an optical system 104. In the block diagram of fig. 4, a rectangle surrounding the outermost periphery of the display system 100 shows a housing 105. The output window 101 is provided inside the display system 100 together with the housing 105. Light is output from the output window 101, and this light is reflected inside the housing 105. In other words, the output window 101 is provided in an opening formed in the frame body 105, and the image 101a displayed by the display system 100 is output from the output window 101. Therefore, the output window 101 is formed using a material such as glass or resin such as acryl, at least a part of which has light transmittance.

The obtaining unit 102 is a processing unit for obtaining an image captured by the imaging device 200 described in fig. 2A. The obtaining unit 102 obtains an image captured by the imaging device 200 by executing an image obtaining program using a processor and a memory, for example. The obtaining unit 102 outputs the obtained image as image information to a display 103 described later, and starts displaying the image on the display system 100. In addition, when the image displayed by the display system 100 is not an image captured by the imaging device 200, an image generating unit, not shown, may be provided instead of the obtaining unit 102. The image generating unit may generate image information corresponding to information to be displayed, for example, a vehicle speed, a detection result of an approaching object, and navigation information from a current position to a destination, and output the image information to the display 103. Further, both the obtaining unit 102 and the image generating unit may be provided.

The display 103 is a device that emits light corresponding to image information output from the obtaining unit 102 or the image generating unit. The display 103 is implemented by a display unit 103a (see fig. 5 described later) including, for example, a Liquid Crystal Display (LCD), an organic electroluminescence display, a micro led (micro led) display, and the like. The display unit 103a is an example of the light supplier in the embodiment. In addition, as described later in detail with reference to fig. 5, the display 103 includes a3 rd retardation film 103b (see fig. 5 described later) through which light emitted from the display member 103a passes, and is configured such that light as circularly polarized light is emitted from the display 103 by the 3 rd retardation film 103 b. Therefore, the display member 103a needs to be capable of emitting linearly polarized light. The linearly polarized light can be realized by combining a general polarizing plate or the like with the display panel. In addition, when an LCD is used as the display member, since the display member can emit linearly polarized light in principle without providing such a polarizing plate or the like, the LCD is preferable as the display member 103a of the present disclosure.

The optical system 104 forms an optical path for guiding light emitted from the display 103 to the output window by reflection, refraction, or the like. The optical system 104 is configured by a plurality of optical devices such as mirrors and lenses. In the present embodiment, the optical system 104 includes a1 st mirror 111, a2 nd mirror 112, and a half mirror 113. The half mirror 113 includes a1 st phase difference film 121, a1 st support substrate 122, and a reflective polarizing film 123. In addition, when the angle of reflection of light in the optical system 104 is allowable, the 1 st support substrate 122 of the half mirror 113 may be implemented as the output window 101.

In the optical system 104 of the present embodiment, light emitted from the display 103 is guided to the output window along a path indicated by a dotted arrow shown in fig. 5. Fig. 5 is a diagram illustrating an optical system of the display system according to the embodiment.

As shown in fig. 5, light corresponding to image information is supplied as P-polarized light from a display portion 103a constituting the display 103. The supplied P-polarized light is circularly polarized via the 3 rd retardation film 103b, which changes the phase of the incident light by imparting a phase difference of 1/4 wavelength to the 3 rd retardation film 103b, and the outgoing light 131 is emitted to the optical system 104. The 3 rd retardation film 103b is an optical device that changes the phase of the P-polarized light supplied from the display member 103a and emits the light as outgoing light.

The outgoing light 131 emitted from the display 103 including the display member 103a and the 3 rd retardation film 103b is reflected by the 2 nd mirror 112. The 2 nd mirror 112 is, for example, a plane mirror, different from the 1 st mirror 111 described later. The 2 nd mirror 112 is disposed in a posture of reflecting the incident outgoing light toward the half mirror 113. The circularly polarized light reflected by the 2 nd mirror 112 has its polarization direction reversed.

As for the half mirror 113, as can be seen from the enlarged view of the portion surrounded by the two-dot chain line in the figure, a light component such as the S-polarized light component of the incident light is reflected as the reflected light 132, and a light component obtained by subtracting the reflected light 132 from the incident light is transmitted as the transmitted light 133. Incident on the half mirror 113 is outgoing light 131 reflected by the 2 nd mirror 112. Here, in the half mirror 113, the 1 st phase difference film 121, the 1 st support substrate 122, and the reflective polarizing film 123 are laminated in this order from the 1 st phase difference film 121, the 1 st support substrate 122, and the reflective polarizing film 123 on the incident side of the outgoing light 131. The outgoing light 131 thus incident on the half mirror 113 passes through the 1 st phase difference film 121, passes through the 1 st support substrate 122, and reaches the reflective polarizing film 123.

The 1 st retardation film 121 is a sheet-like optical device that changes the phase of incident light. The 1 st retardation film 121 imparts a retardation of 1/4 wavelengths to the transmitted light. Therefore, the 1 st retardation film 121 changes the phase of the incident circularly polarized light to linearly polarized light. As described above, since the light incident on the half mirror 113 from the 2 nd reflecting mirror 112 is circularly polarized light, it is changed into linearly polarized light and enters the 1 st supporting substrate 122. Here, since the circularly polarized light whose rotation direction is reversed is changed by the reflection of the 2 nd mirror 112, the S-polarized light is generated as the linearly polarized light. The function of imparting 1/4-wavelength phase difference is applicable to a wavelength range of visible light that can be visually recognized by a human in the outgoing light emitted from the display 103. Such a wavelength range is for example the range from 400nm to 700 nm. Further, the function can also be applied to a wavelength range that sufficiently includes the wavelength range of visible light. Such a wavelength range is for example the range from 350nm to 850 nm.

The 1 st support substrate 122 is a light-transmitting rigid plate-like member, and supports the flexible sheet-like 1 st retardation film 121 in a state where the film is directly attached to one main surface thereof, and the flexible sheet-like reflective polarizing film 123 is directly attached to the other main surface thereof. In addition, the 1 st support substrate 122 preferably has an optical influence on transmitted light suppressed. Thus, the light transmitted through the 1 st retardation film 121 can reach the reflective polarizing film 123 substantially in the original state. The 1 st support substrate 122 is, for example, a glass plate having a rectangular main surface, but the 1 st support substrate 122 may be any material and shape as long as it has the properties.

The reflective polarizing film 123 is an optical device that reflects the S-polarized light component and transmits the P-polarized light component orthogonal to the vibration direction of the S-polarized light component. The light transmitted through the 1 st phase difference film 121 via the 1 st support substrate 122 is incident on the reflective polarizing film 123. The incident light is changed from circularly polarized light to linearly polarized light. Since the linearly polarized light is S-polarized light, it is reflected by the reflective polarizing film 123, passes through the 1 st support substrate 122, and enters the 1 st phase difference film 121 again. The 1 st retardation film 121 has an effect of suppressing directivity, and similarly changing the phase of light incident from any one of the principal surfaces. Thus, the S-polarized light reflected by the reflective polarizing film 123 enters the 1 st phase difference film 121 and changes to circularly polarized light. In addition, the phase difference generated at the 1 st phase difference film 121 may be in the range from 1/3 to 1/5. In this case, the optical system 104 can be designed so that the amount of light of the S-polarized light component reflected by the reflective polarizing film 123 becomes a desired amount of light.

The reflected light 132 including the light that has thus become circularly polarized light enters the 1 st mirror 111. The 1 st mirror 111 has a concave surface, and reflects incident light at the concave surface. This has the effect of making the light appear to be located further away than it actually is by reflecting the light with the concave surface.

The reflected light 132 incident on the 1 st mirror 111 is further reflected by the 1 st mirror 111. In this case, the circularly polarized light included in the reflected light 132 reverses the rotation direction of the polarized light. The 1 st mirror 111 is formed such that the reflected light 132 enters the 1 st mirror 111 and the incident reflected light 132 is reflected from the 1 st mirror 111 toward the half mirror 113. Thus, the reflected light 132 reflected by the 1 st mirror 111 enters the half mirror 113 again.

The reflected light 132 incident on the half mirror 113 includes a large amount of light in which the rotation direction of circularly polarized light having a changed phase of S-polarized light is reversed. In other words, most of the reflected light 132 becomes P-polarized light at the 1 st phase difference film 121 of the half mirror 113. The component of the reflected light 132 that becomes P-polarized light reaches the reflective polarizing film 123, passes through the reflective polarizing film 123, and is emitted from the output window 101. For example, the driver visually recognizes an image formed by projecting light emitted from the output window 101 on the retina as an image displayed on the output window of the display system 100.

Here, fig. 6A is a diagram illustrating components constituting reflected light in a conventional display system. Fig. 6B is a diagram illustrating components constituting reflected light in the display system according to the embodiment. Fig. 6A and 6B show the structures of the half mirror 113a in the conventional display system and the half mirror 113 in the display system 100 according to the present embodiment in detail.

As shown in fig. 6A and 6B, the 1 st retardation film 121 includes a1 st retardation layer 121a and an adhesive layer 121B, and the 1 st retardation film 121 is adhered to an adhesion object through the adhesive layer 121B. Similarly, as shown in fig. 6A and 6B, the reflective polarizing film 123 has a reflective polarizing layer 123a, an adhesive layer 123B, and the reflective polarizing film 123 is adhered to the adhesion object through the adhesive layer 123B.

As shown in fig. 6A, the half mirror 113a used in the conventional display system has a reflective polarizing film 123 laminated on a1 st support substrate 122, and a1 st phase difference film 121 laminated thereon. The 1 st support substrate 122 is a hard member and therefore has high flatness, and the reflective polarizing film 123 laminated thereon is soft and therefore loses flatness. As a result, a surface with reduced flatness (in other words, a non-flat surface) is formed on the boundary surface between the adhesive layer 123b and the reflective polarizing layer 123a, and on the surface of the reflective polarizing layer 123a on the opposite side of the boundary surface.

Further, the 1 st retardation film 121 is laminated on the surface having the reduced flatness, so that the flatness is largely lost. Specifically, the boundary surface between the adhesion layer 121b and the 1 st retardation layer 121a and the surface of the 1 st retardation layer 121a opposite to the boundary surface form a surface with greatly reduced flatness.

On such a non-flat surface, an unexpected reflection occurs due to the wavelength, incident angle, and the like of the incident light, and the lights reflected at the respective interfaces interfere with each other, thereby possibly causing a coloring phenomenon. The interfered light includes light originally reflected by the reflective polarizing film 123 as indicated by solid arrows in the drawing at the reflective polarizing film 123. In the figure, the boundary surface between the 1 st retardation layer 121a and the adhesive layer 121b is a surface whose flatness is significantly reduced as described above, and as indicated by solid arrows in the figure, there is a possibility that much light is reflected depending on the conditions. Similarly, since the uneven surface is suppressed to a certain degree even if the interface between the adhesive layer 121b and the reflective polarizing layer 123a has reduced flatness, it is difficult to reflect light as indicated by the broken-line arrow in the figure.

On the other hand, as shown in fig. 6B, in the half mirror 113 used in the display system 100 of the present embodiment, the 1 st retardation film 121 is laminated on one main surface of the 1 st support substrate 122, and the reflective polarizing film 123 is laminated on the other main surface. Therefore, the degree of reduction in flatness on either surface can be suppressed to a certain degree. Accordingly, in the display system 100, the formation of uneven surfaces is suppressed, and therefore, as indicated by the broken-line arrow marks in the figure, it is difficult to generate unexpected reflection.

Fig. 7 is a diagram illustrating an image displayed by the display system according to the embodiment. Fig. 7 shows a state where no pattern such as a pattern is present in the image displayed by the display system 100, as in fig. 3. When viewing fig. 7, the coloring phenomenon of the wavy stripes of different colors appearing depending on the viewing direction in the example of fig. 3 does not occur, and it can be confirmed that the image 101a displayed on the display system 100 is good. As described above, the display system 100 according to the present embodiment can effectively suppress the coloring phenomenon, and can display the image 101a more appropriately.

[ modification 1]

The display system 100 according to a modification of the embodiment will be described below. In the following description, differences from the above-described embodiment will be mainly described, and description of the configuration substantially the same as that of the above-described embodiment will be omitted or simplified. Fig. 8 is a diagram illustrating an optical system of a display system according to modification 1 of the embodiment. Fig. 8 shows a portion of the display system 100a without the 2 nd mirror 112, which is different from the embodiment.

In this modification, the light emitted from the display member 103a is changed to circularly polarized light by the 3 rd retardation film 103b, reflected by the half mirror 113, and enters the 1 st mirror 111 in a state of circularly polarized light in the same rotational direction. The circularly polarized light entering the 1 st mirror 111 enters the half mirror 113 again. In the half mirror 113, the light changed from the circularly polarized light to the P-polarized light reaches the reflective polarizing film 123, and is transmitted through the reflective polarizing film 123 to be emitted from the output window 101.

Thus, the display system 100 can be realized without the configuration of the 2 nd mirror 112. Therefore, the 2 nd mirror 112 is not necessary. In addition, by not providing the 2 nd mirror 112 in this way, the display system 100a can be downsized and cost-saving.

The 2 nd reflecting mirror 112 may be provided in plural, or a concave mirror and a convex mirror may be arbitrarily combined instead of a plane mirror. Further, the optical configuration of the 2 nd mirror 112 is not limited by the embodiment. For example, the 2 nd mirror 112 may be disposed between the optical paths from the half mirror 113 to the 1 st mirror 111, and the 2 nd mirror 112 may be disposed between the optical paths from the 1 st mirror 111 to the half mirror 113, or both. Any optical system 104 may be formed in the manner required by the display system 100.

[ modification 2]

Fig. 9A is a diagram 1 illustrating a half mirror of a display system according to modification 2 of the embodiment. Fig. 9B is a diagram 2 illustrating a half mirror of a display system according to modification 2 of the embodiment. In the display system 100 shown in fig. 9A and 9B, the configuration of the half mirror 113 is different from that of the above-described embodiment.

In the example of fig. 9A, the half mirror 113b includes a2 nd support substrate 124. Specifically, a2 nd support substrate 124 is further laminated on the surface of the reflective polarizing film 123 opposite to the 1 st support substrate 122. In the 2 nd support substrate 124, the 2 nd support layer 124a constituting the 2 nd support substrate 124 is laminated on the reflective polarizing layer 123a of the reflective polarizing film 123 by the adhesive layer 124 b. The 2 nd support layer 124a of the 2 nd support base 124 is formed of a hard material, as in the 1 st support base 122. Therefore, with such a configuration, the flatness of the reflective polarizing film 123 sandwiched between the 2 nd support layer 124a and the 1 st support substrate 122 can be ensured. Therefore, the display system 100 having the half mirror 113b can display the image 101a more appropriately.

In the example of fig. 9B, the half mirror 113c includes a3 rd support substrate 126. Specifically, a3 rd supporting substrate 126 is further laminated on the surface of the 1 st retardation film 121 opposite to the 1 st supporting substrate 122. The 3 rd support substrate 126 is laminated by a3 rd support layer 126a constituting the 3 rd support substrate 126, adhering to the 1 st retardation layer 121a of the 1 st retardation film 121 through an adhesive layer 126 b. However, with such a configuration, the flatness of the 1 st retardation film 121 sandwiched between the 3 rd support layer 126a and the 1 st support substrate 122 can be ensured. Therefore, the display system 100 having the half mirror 113c can display the image 101a more appropriately.

[ modification 3]

Fig. 10 is a diagram illustrating a half mirror of a display system according to modification 3 of the embodiment. As the display system 100 shown in fig. 10, the half mirror 113 is different in configuration from the embodiment.

In the present modification, the half mirror 113d includes the 2 nd retardation film 125. Specifically, a2 nd retardation film 125 is further laminated on the surface of the reflective polarizing film 123 opposite to the 1 st support substrate 122. The 2 nd retardation film 125 is laminated by adhering the 2 nd retardation layer 125a constituting the 2 nd retardation film 125 to the reflective polarizing layer 123a of the reflective polarizing film 123 through the adhesive layer 125 b. The 2 nd retardation film 125 changes the phase of incident light by giving a retardation of 1/4 wavelength, and changes linearly polarized light and circularly polarized light in both directions, similarly to the 1 st retardation film 121. As described in the above embodiment, the light transmitted through the reflective polarizing film 123 is P-polarized light among linearly polarized light, and for example, when a driver wearing a polarized sunglass looks at the light, the light may not be seen at all or may be difficult to see depending on the direction of the polarized light. On the reflective polarizing film 123, a2 nd phase difference film 125 is further laminated, so that the P-polarized light transmitted through the reflective polarizing film 123 is directed toward the output window 101 as circularly polarized light. In other words, the display system 100 can be realized that can provide high visibility even for a driver wearing polarized sunglasses or the like. Therefore, the display system 100 having the half mirror 113d can display the image 101a more appropriately.

(embodiment mode 2)

Next, a display system applicable to vehicles of various types will be described.

For example, patent document 2 describes a mirror adjustment device including a mirror attached to a vehicle and an image detection unit. The image detection unit comprises a video camera for making and recording images of the head of the driver. The rearview mirror is located diagonally forward of the driver when viewed from above the vehicle. The image detection unit is located in front of the driver when viewed from above the vehicle.

In the mirror adjusting device described in patent document 1, the mounting position of the camera is limited for each vehicle type, and it is difficult to apply the mirror adjusting device to vehicles of a plurality of vehicle types in common.

An object of embodiment 2 described below is to provide a display system that can be applied to vehicles of a plurality of vehicle types and can display images more appropriately.

As an example, the display system of the present embodiment includes a display, a half mirror, a1 st mirror, a housing, and a camera. The display has a display surface that displays an image behind the vehicle. The half mirror reflects light emitted from the display. The 1 st mirror reflects the light reflected by the mirror. The display, the half mirror, and the 1 st mirror are built in the frame body. The camera is arranged on the frame body. The housing has an exit portion for emitting the light reflected by the 1 st mirror. In the display system, the light emitted from the emission portion is incident on the eyes of the observer, and the image is displayed. The camera shooting direction of the camera faces to the interior of the vehicle.

With the above configuration, the display system according to the present embodiment has an advantage that it can be applied to vehicles of various types.

Fig. 11 to 32C, which will be described in the following embodiments and the like, are conceptual views, and the size and thickness ratio of each component in the drawings do not necessarily reflect the actual size ratio.

[ summary ]

As shown in fig. 11, a display system 301 according to embodiment 2 is a system used in a vehicle (automobile) 400 as a moving object, for example.

The display system 301 is mounted on a moving body main body of a moving body. The moving body main body of the moving body is a main body (vehicle body) 410 of the vehicle 400.

The display system 301 includes a display 302, a half mirror 303, a1 st reflecting mirror 304 as a concave mirror, and a housing 305.

The display 302 has a display surface 321 on which an image behind the vehicle 400 is displayed. The image is output from, for example, an imaging unit 309 (see fig. 12) that images the rear of the vehicle 400. The imaging unit 309 is mounted on the body 410 of the vehicle 400. The display system 301 and the image pickup unit 309 (see fig. 12) of the present embodiment constitute an electronic mirror system 310. The mobile object includes an electronic mirror system 310 and a main body 410 on which the electronic mirror system 310 is mounted.

The half mirror 303 reflects light emitted from the display 302. The 1 st mirror 304 reflects the light reflected by the half mirror 303. The housing 305 houses the display 302, the half mirror 303, and the 1 st mirror 304. The housing 305 has an emission portion 358, and the emission portion 358 emits the light reflected by the 1 st mirror 304. In the display system 301, when an image of the rear of the vehicle is displayed on the display surface 321, the image reflected by the half mirror 303 and the 1 st mirror 304 is emitted from the emission portion 358.

In the display system 301, the light emitted from the emission portion 358 enters the eyes of the observer 500 to display an image. Accordingly, the observer 500 can see an image based on the light emitted from the display surface 321 of the display 302. Observer 500 is, for example, a driver of vehicle 400.

Further, the display system 301 includes a camera 306. The camera 306 is provided in the frame body 305. In the display system 301, the imaging direction of the camera 306 faces the interior 404 of the vehicle 400.

The display system 301 is disposed at a position that is at a front side portion of the ceiling portion 401 of the main body 410 near the windshield 402 (front window) and that enables entry into the line of sight of an observer 500 seated in the driver seat 430 with the observer 500 facing forward (see fig. 11).

[ constitution ]

As described above, the display system 301 according to the present embodiment includes the display 302, the half mirror 303, the 1 st mirror 304, the housing 305, and the camera 306.

The display 302 is housed in a housing 305. The display 302 is positioned above the inner space S1 of the housing 305. The display 302 is housed in the housing 305 with the display surface 321 facing downward. The display 302 outputs light forming an image of an image. The Display 302 includes, for example, a light source device and a Liquid Crystal panel (Liquid Crystal Display). The liquid crystal panel is disposed in front of the light source device. The light source device is used as a backlight of a liquid crystal panel. The light source device is a surface light source. The light source device is a side-light type light source device using a solid-state light emitting element such as a light emitting diode or a laser diode. Light from the light source device passes through the liquid crystal panel and is emitted from the display surface 321 of the display 302. An image is formed by light emitted from the display surface 321 of the display 302. The light output from the display surface 321 is light reflecting an image displayed on the liquid crystal panel. In fig. 11 and 12, the path of light output from one point (a certain pixel) of the image displayed on the display screen 321 of the display 302 is illustrated in a dotted line pattern.

The display system 301 of the present embodiment includes a half mirror 303 and a1 st mirror 304 as a reflecting member for reflecting light emitted from a display surface 321 of a display 302. That is, the display system 1 has an optical system including the half mirror 303 and the 1 st mirror 304.

The half mirror 303 has a function of transmitting a part of incident light and reflecting another part of the incident light. The half mirror 303 is formed of a plate-like beam splitter having a light transmittance and a light reflectance of about 50%. The half mirror 303 reflects light emitted from the display 302 toward the 1 st mirror 304, and transmits light reflected by the 1 st mirror 304. The half mirror 303 is disposed below the display surface 321 of the display 302. The half mirror 303 is disposed at a position apart from the 1 st mirror 304 on the side of the reflection surface 341 of the 1 st mirror 304. The half mirror 303 is disposed obliquely to a plane orthogonal to the direction in which the 1 st mirror 304 and the half mirror 303 are arranged, such that the distance between the 1 st mirror 304 and the upper end 333 of the half mirror 303 is longer than the distance between the 1 st mirror 304 and the lower end 334 of the half mirror 303 in the direction in which the 1 st mirror 304 and the half mirror 303 are arranged. Thus, the half mirror 303 has the upper end 333 of the half mirror 303 located rearward of the lower end 334 of the half mirror 303 in the front-rear direction of the vehicle 400.

The half mirror 303 has a1 st surface 331 and a2 nd surface 332 intersecting the thickness direction thereof. The 1 st surface 331 of the half mirror 303 faces the display surface 321 of the display 302 and the reflection surface 341 of the 1 st mirror 304, respectively. Here, "opposed" means that 2 surfaces face each other, and 2 surfaces are not necessarily parallel. In the present embodiment, the 1 st surface 331 is a flat surface, but the 1 st surface 331 may be a curved surface like a free curved surface. By making the 1 st surface 331 of the half mirror 303a free curved surface, distortion of an image formed on the reflection surface 341 of the 1 st mirror 304 can be reduced, curvature of an image plane can be reduced, or resolution can be improved.

The 1 st mirror 304 has, for example, a concave mirror body including glass and a reflection film provided on a surface of the concave mirror body. The material of the concave mirror body includes, for example, glass. The material of the reflective film is preferably a metal having a high reflectance to visible light, and includes aluminum, for example. The optical system L1 including the half mirror 303 and the 1 st mirror 304 is arranged such that the 1 st mirror 304 is positioned on the front side and the half mirror 303 is positioned on the rear side in the space S1 inside the housing 305. The 1 st mirror 304 is disposed in the inner space S1 of the housing 305 with the reflecting surface 341 facing rearward. In other words, the 1 st mirror 304 is disposed in the space S1 inside the housing 305 at a position facing the 1 st surface 331 of the half mirror 303.

In the optical system L1 including the half mirror 303 and the 1 st mirror 304, light emitted from the display surface 321 of the display 302 is reflected toward the 1 st mirror 304 on the 1 st surface 331 of the half mirror 303. The reflection surface 341 of the 1 st mirror 304 reflects the light from the half mirror 303 toward the half mirror 303. The half mirror 303 transmits light from the 1 st mirror 304.

The housing 305 has a light emitting portion 358 for emitting light reflected by the 1 st mirror 304 and transmitted through the half mirror 303. The emission portion 358 transmits visible light. Accordingly, the display system 301 allows the observer 500 to see an image based on the image displayed on the display surface 321 of the display 302 by the light emitted from the emission portion 358 entering the eye 501 of the observer 500. That is, the observer 500 can see the image reflected by the half mirror 303 and the 1 st mirror 304 of the optical system L1. Therefore, in the direction in which the reflection surface 341 of the 1 st mirror 304 is viewed through the half mirror 303, the image that the observer 500 sees the display 302 appears to be displayed at a display position that is farther (for example, 1 to 3m ahead from the viewpoint of the observer 500) than the reflection surface 341. In other words, the image of the display 302 becomes a virtual image. This has the advantage that the observer 500 can easily adjust the focus when looking at the image (virtual image) displayed by the display system 301 from the state in which the observer views the front field of view through the windshield 402.

The housing 305 includes a main body 350 and an emission portion 358. The body 350 has a front wall 351, a rear wall 352, an upper wall 353, a lower wall 354, a1 st side wall 355 (right side wall as viewed from the viewer 500), and a2 nd side wall 356 (left side wall as viewed from the viewer 500), and is in the shape of a box having an opening 821 (through hole) in the rear wall 352, and the body 350 has an inner space S1. The material of the frame body 305 contains resin. The opening 821 is rectangular, and has a larger opening width in the left-right direction than in the up-down direction, and the ratio of the opening width in the left-right direction to the opening width in the up-down direction is about 3 to 6: 1. the light emitting portion 358 has a rectangular outer peripheral shape and is flat, and is disposed so as to cover the opening 821 of the rear wall 352. In a state where the housing 305 is attached to the body 410 of the vehicle 400, the dimension of the body 410 in the left-right direction (vehicle width direction) is larger than both the dimension in the up-down direction and the dimension in the front-rear direction.

The housing 305 is attached to a front portion of the ceiling portion 401 of the main body 410 near the windshield 402, and is disposed at a position where it enters the field of view of the observer 500 on the front seat such as the driver seat 430 (see fig. 12). The housing 305 is attached to the ceiling portion 401 of the main body 410 via the support member 372, and is suspended from the ceiling portion 401. Here, the housing 305 is disposed at a position not obstructing the front view of the observer 500. The support member 372 has an adjustment mechanism (e.g., ball joint) for adjusting the orientation of the housing 305. The housing 305 is not limited to being attached to the ceiling portion 401, and may be attached to the windshield 402, for example.

In the present embodiment, the camera 306 is positioned around the emission portion 358. The camera 306 is provided at the center in the left-right direction of the lower portion of the rear wall 352 of the housing 305. The camera 306 has a camera shooting direction D1 facing the interior 404 of the vehicle 400. More specifically, the imaging direction D1 of the camera 306 is, for example, the optical axis direction of the lens 361 of the camera 306. The camera 306 is an infrared camera used for near-infrared imaging, but is not limited to this, and may be a camera capable of both near-infrared imaging and visible light imaging.

In the display system 301, the imaging direction D1 of the camera 306 is toward the interior 404 of the vehicle 400. In the display system 301, the imaging direction D1 of the camera 306 faces the headrest 431 of the driver seat 430 in the vehicle interior 404. Accordingly, the eyes 501 of the observer 500, which is a driver sitting in the driving seat 430, can be photographed.

Further, by disposing the camera 306 below the emission portion 358 as shown in fig. 11, when the observer 500 wears a hat, the possibility that the visor blocks the eyes 501 of the observer 500 can be reduced.

In the display system 301, it is preferable that the emission direction of the light from the emission portion 358 is along the imaging direction D1 of the camera 306. Here, in the display system 301, it is preferable that the emission direction of the light from the emission portion 358 is substantially parallel to the imaging direction D1 of the camera 306. Here, "parallel" includes not only a case of being strictly parallel but also a case of being substantially parallel. The substantially parallel relationship includes a case where the angle formed by the emission direction of the light from the emission portion 358 and the imaging direction D1 of the camera 306 is 10 degrees or less.

The display system 301 further includes 2 near infrared light sources 307. The 2 near-infrared light sources 307 emit near-infrared light, respectively. The 2 near infrared light sources 307 are near infrared leds (light Emitting diodes), respectively. The 2 near infrared light sources 307 are provided 1 on each side of the camera 306 in the left-right direction of the housing 305. Each optical axis of the 2 near infrared light sources 307 is a direction along the image pickup direction D1 of the camera 306. It is preferable that the respective optical axes of the 2 near infrared ray light sources 307 are parallel to the image pickup direction D1 of the camera 306. Here, "parallel" includes not only a case of being strictly parallel but also a case of being substantially parallel. The substantial parallelism includes a case where the angle formed by the optical axis of the near infrared light source 307 and the imaging direction D1 of the camera 306 is 10 degrees or less.

The display system 301 further includes a control unit 308. The control unit 308 is electrically connected to the display 302 and the camera 306. The controller 308 is also connected to 2 near infrared light sources 307. The control unit 308 controls the display state of the image on the display 302. The control unit 308 communicates (wired or wireless) with the image pickup unit 309 via, for example, an in-vehicle network of the vehicle 400. The control unit 308 receives image data of the captured image of the rear side of the vehicle 400 from the imaging unit 309. The control unit 308 causes the display 302 to display an image based on the captured image input from the imaging unit 309. The image based on the captured image may be the captured image itself, may be an image obtained by image processing the captured image, or may be a cg (computer graphics) image created based on the captured image. For example, since the image captured by the image capturing unit 309 is dark at night, the brightness of the image captured by the image capturing unit 309 can be corrected. Further, an image such as a CG image or a marker showing an obstacle or the like reflected in the image may be generated based on the image captured by the imaging unit 309 and displayed on the display surface 321 of the display 302, and an image such as a CG image or a marker may be superimposed on the image captured by the imaging unit 309. Further, an image in which a mark of driving support information (for example, vehicle speed information, navigation information, pedestrian information, preceding vehicle information, lane departure information, vehicle state information, and the like) is superimposed on the captured image of the imaging unit 309 may be displayed on the display 302.

The control section 308 includes a computer system. A computer system is mainly composed of a processor and a memory as hardware. The function of the control unit 308 is realized by the processor executing a program recorded in the memory of the computer system. The program may be recorded in advance in a memory of the computer system, may be provided via an electric communication line, or may be provided via a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that is readable by the computer system. A processor of a computer system is constituted by 1 or more electronic circuits including a semiconductor Integrated Circuit (IC) or a large scale integrated circuit (LSI). The integrated circuits such as IC and LSI are referred to as system LSI, VLSI (Very Large Scale Integration), or ulsi (ultra Large Scale Integration), depending on the degree of Integration. Furthermore, an FPGA (Field-Programmable Gate Array) programmed after the manufacture of the LSI, or a logic device capable of reconstructing a connection relationship within the LSI or reconstructing a circuit region within the LSI may be used as the processor. The plurality of electronic circuits may be collectively provided on 1 chip or may be dispersed over a plurality of chips. The plurality of chips may be collectively provided in 1 device or may be distributed among a plurality of devices. The computer system described herein includes a microcontroller having more than 1 processor and more than 1 memory. Therefore, regarding the microcontroller, it is constituted by 1 or more electronic circuits including a semiconductor integrated circuit or a large scale integrated circuit.

The imaging unit 309 is, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor attached to the rear part of the vehicle 400, and images the rear part of the vehicle 400. The imaging unit 309 is not limited to a CMOS image sensor, and may be an image sensor such as a ccd (charge Coupled device) image sensor.

The image pickup unit 309 outputs image data for picking up an image of the rear side of the vehicle 400 to the control unit 308 via, for example, an in-vehicle network. The image pickup unit 309 is disposed at the center in the left-right direction of the rear portion of the vehicle 400, for example, and picks up an image of a range that can be visually recognized by a conventional interior mirror, and the electronic mirror system 310 is used as a rear recognition mirror like a conventional interior mirror. Since the image pickup unit 309 is attached to the rear portion of the vehicle 400, the rear seat, the pillar, and the like are not reflected in the image picked up by the image pickup unit 309. The rear side of the vehicle 400 may include the rear side of the vehicle 400, and the image pickup unit 309 may pick up an image of the rear side of the vehicle 400. The image pickup unit 309 can pick up an image of a range where the conventional door mirror or exterior mirror can be visually recognized, and can use the electronic mirror system 310 as a rear confirmation mirror instead of the conventional door mirror or exterior mirror. The image pickup unit 309 is attached to the rear portion of the main body 410, that is, the upper portion of the main body 410, but the attachment position of the image pickup unit 309 is an example, and the image pickup unit 309 may be attached to a position where a desired range can be imaged.

In the display system 301 of the present embodiment, an image displayed on the display 302, in other words, light output from the display surface 321 of the display 302 is reflected 1 time by the half mirror 303 and the 1 st mirror 304, respectively. In other words, in the display system 301, the light output from the display surface 321 of the display 302 is reflected 2 times by the optical system L1. Here, the distance (visible distance) from the observer 500 to the display position of the image visually recognized by the observer 500 is determined by the optical distance from the display surface 321 of the display 302 to the reflection surface 341 of the 1 st mirror 304, the focal length of the optical system L1, and the like. In the present embodiment, the light emitted from the display surface 321 of the display 302 is reflected 2 times, so that the size of (the inner space S1 of) the housing 305 can be reduced while the visible distance to the display position of the image is kept at a desired distance. Accordingly, the size of the housing 305 can be reduced in the direction in which the observer 500 views the reflection surface 341 through the half mirror 303.

[ actions ]

The following description relates to operations of the display system 301 and the electronic mirror system 310 including the display system 301 according to the present embodiment.

For example, when electric power is supplied to the electronic mirror system 310 from a battery of the vehicle 400, and a Control signal for starting the operation of the electronic mirror system 310 is input from an ecu (electronic Control unit) provided in the vehicle 400, the electronic mirror system 310 starts the operation.

For example, when a control signal for starting the operation is input from the ECU of the vehicle 400 to the control unit 308, the control unit 308 causes the image pickup unit 309 to pick up an image of the rear of the vehicle 400 at a predetermined frame rate, and obtains image data of the picked-up image from the image pickup unit 309.

When image data of a captured image is input from the imaging unit 309, the control unit 308 creates an image based on the captured image and displays the image on the display surface 321 of the display 302.

When an image is displayed on the display surface 321 of the display 302, light forming the image is emitted to the 1 st surface 331 of the half mirror 303. The 1 st surface 331 of the half mirror 303 reflects light from the display 302 toward the 1 st mirror 304. The 1 st mirror 304 reflects light forming an enlarged image obtained by enlarging the image on the display surface 321 toward the 1 st surface 331 of the half mirror 303. When light reflected by the reflection surface 341 of the 1 st mirror 304 enters the 1 st surface 331 of the half mirror 303, a part of the light passes through the half mirror 303 and exits from the exit portion 358 of the housing 305 to the outside, so that the observer 500 can see an image enlarged by the reflection surface 341. Accordingly, the observer 500 can check the situation behind the vehicle 400 by viewing the image enlarged by the reflection surface 341 through the half mirror 303.

When the control signal is input, the control unit 308 causes the camera 306 to capture the face of the observer 500 in the imaging direction D1 at a predetermined frame rate, and obtains image data of the captured image from the camera 306. Here, the camera 306, for example, photographs the face of the observer 500 including the eyes 501. When the imaging direction D1 of the camera 306 is directed toward the headrest 431 of the driver seat 430, the camera 306 can be used as a camera for a driver monitor for monitoring the observer 500, i.e., the driver (driver).

The control unit 308 detects the position of the eyes 501 of the observer 500 from the captured image from the camera 306, and may have a function of detecting that the observer 500 does not see the front and is dozing. The control unit 308 may also have a function of detecting the posture of the observer 500 from the captured image from the camera 306. The control unit 308 may detect a value or a displacement amount of at least one of the face position, the viewpoint position, and the line-of-sight direction of the observer 500 from the captured image of the observer 500 captured by the camera 306, and may change at least one of the position and the size of the image displayed on the display surface 321 of the display 302 based on the detected value or displacement amount. In other words, the control unit 308 controls the display 302 so that the image displayed on the display surface 321 of the display 302 can be moved, enlarged, or reduced. Accordingly, the visual field range can be moved greatly by slightly moving the face position and the viewpoint position in the vertical and horizontal directions, or the visual field range can be enlarged or reduced to be small by slightly moving the face position and the viewpoint position in the front and rear directions. Further, by moving the sight line direction to the end direction of the visual field, the visual field range can be moved without changing the viewpoint position and the face position.

The control unit 308 may be configured to detect the viewpoint position of the observer 500 from the captured image of the observer 500 captured by the camera 306, and to issue a warning signal when determining that the viewpoint position is displaced from a predetermined window (Eye-Box). The "window" is a range in which the observer 500 can visually confirm the absence of the defective image. The "viewing window" is a view point range in which a part of a virtual image is reflected on the entire visual field of the eyes 501 of the observer 500.

The display system 301 may further include the support member 372, and the support member 372 may include the above-described adjustment mechanism as a drive unit that changes the emission direction of the light from the emission unit 358 by driving the housing 305. In this case, the control unit 308 is electrically connected to the display 302, the camera 306, and the driving unit. The control unit 308 detects the viewpoint position of the observer 500 from the captured image of the observer 500 captured by the camera 306, and controls the drive unit so as to drive the housing 305 in accordance with the viewpoint position. Accordingly, the display system 301 can make the light emitted from the emission portion 358 of the housing 305 follow the viewing direction of the observer 500.

[ advantages ]

The display system 301 according to embodiment 2 is configured such that light emitted from the emission portion 358 enters the eyes 501 of the observer 500 to display an image. Further, since the display system 301 has the camera 306 in the housing 305 including the display 302, the half mirror 303, and the 1 st reflecting mirror 304, and the imaging direction D1 of the camera 306 faces the vehicle interior 404 of the vehicle 400, it is not necessary to secure an attachment position and an attachment structure for mounting the camera 306 on the vehicle 400 in the vehicle 400, and the display system can be applied to vehicles of various types.

Further, since the camera 306 faces the interior 404 of the vehicle, particularly, the direction of the observer 500, the angle of view of the camera 306 can be narrowed, and the ratio of the observer 500 to the captured image can be increased. Therefore, even when the number of pixels of the camera 306 is relatively small, the viewpoint position and the line of sight of the observer 500 can be detected with high accuracy. In addition, when the number of pixels of the camera 306 is relatively large (for example, when the number of pixels is equivalent to that of the video camera described in patent document 1), the resolution can be improved by narrowing the angle of view, and therefore, the accuracy of detecting the viewpoint position and the line of sight of the observer 500 can be improved more than before.

The embodiment 2 described above is only one of various embodiments of the present disclosure. Embodiment 2 can be applied to vehicles of various types, and various modifications can be made in accordance with design and the like as long as the purpose of displaying images more appropriately is achieved.

[ modification 1]

A display system 301 according to example 1 of modification 1 of embodiment 2 will be described below with reference to fig. 14.

The display system 301 according to example 1 of modification 1 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the camera 306 and the 2 near infrared light sources 307 are disposed at the center in the left-right direction of the lower surface of the lower wall 354 of the housing 305. In the display system 301 according to example 1 of modification 1 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301 according to example 1 of modification 1 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 protrude downward from the housing 305, and therefore, it is not necessary to enlarge the housing 305 itself. Further, the camera 306 and the 2 near infrared light sources 307 are located below the housing 305, and when the observer 500 wears a hat, for example, the camera 306 images the eyes 501 of the observer 500 and the near infrared light sources 307 irradiate the eyes 501 of the observer 500 with near infrared light, and thus the eyes are less likely to be obstructed by the hat.

A display system 301 according to example 2 of modification 1 of embodiment 2 will be described below with reference to fig. 15. The display system 301 according to example 2 of modification 1 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the camera 306 and the 2 near infrared light sources 307 are disposed at the right end in the left-right direction of the lower surface of the lower wall 354 of the housing 305. In the display system 301 according to example 2 of modification 1 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301 according to example 2 of modification 1 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 protrude downward from the housing 305, and therefore the emission portion 358 visible to the observer 500 in the housing 305 can be made large without making the housing 305 large.

In the display system 301 according to example 2 of modification 1 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 are located closer to the face of the observer 500, which is the driver of the vehicle 400 on the right steering wheel, than in the display system 301 according to example 1 of modification 1 of embodiment 2, and therefore, it is advantageous to capture the images of the eyes 501 of the observer 500 and to irradiate the eyes 501 of the observer 500 with near infrared light from the near infrared light sources 307. In addition, when the present invention is applied to a vehicle with a left-hand steering wheel, the camera 306 and the 2 near infrared light sources 307 are preferably provided at the left end in the left-right direction of the lower surface of the lower wall 354 of the housing 305.

Next, a display system 301 according to example 3 of modification 1 of embodiment 2 will be described with reference to fig. 16.

The display system 301 according to example 3 of modification 1 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the camera 306 is disposed at the center in the left-right direction of the lower surface of the lower wall 354 of the housing 305, and the 2 near infrared light sources 307 are disposed at the center in the left-right direction of the upper surface of the upper wall 353 of the housing 305. In the display system 301 according to example 3 of modification 1 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

The 2 near infrared light sources 307 are separated from each other in the left-right direction of the housing 305.

The display system 301 according to example 3 of modification 1 of embodiment 2 is less likely to block the front view of the observer 500, as compared with the case where the 2 near infrared light sources 307 of the display system 301 according to example 1 of modification 1 of embodiment 2 protrude downward from the lower wall 354 of the housing 305.

A display system 301 according to example 4 of modification 1 of embodiment 2 will be described below with reference to fig. 17.

The display system 301 according to example 4 of modification 1 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the camera 306 is disposed at the center in the left-right direction of the lower surface of the lower wall 354 of the housing 305, and the 2 near infrared light sources 307 are disposed separately on the 1 st side wall 355 and the 2 nd side wall 356 of the housing 305. In the display system 301 according to example 4 of modification 1 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

The display system 301 according to example 4 of modification 1 of embodiment 2 is less likely to block the front view of the observer 500 than the display system 301 according to example 1 of modification 1 of embodiment 2 in which the 2 near infrared light sources 307 protrude downward from the lower wall 354 of the housing 305.

A display system 301 according to example 5 of modification 1 of embodiment 2 will be described below with reference to fig. 18.

The display system 301 according to example 5 of modification 1 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the camera 306 and the 2 near infrared light sources 307 are disposed on the 1 st side wall 355 of the housing 305. In the display system 301 according to example 5 of modification 1 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301 according to example 5 of modification 1 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 protrude from the housing 305 to the right side, and therefore, it is not necessary to enlarge the housing 305 itself.

In the display system 301 according to example 5 of modification 1 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 are located closer to the face of the observer 500, which is the driver of the vehicle 400 on the right steering wheel, than in the display system 301 according to example 1 of modification 1 of embodiment 2, and therefore it is advantageous to image the eyes 501 of the observer 500 and to irradiate the eyes 501 of the observer 500 with near infrared light from the near infrared light sources 307. When the present invention is applied to a vehicle with a left-hand steering wheel, the camera 306 and the 2 near infrared light sources 307 are preferably provided on the 2 nd side wall 356 of the housing 305.

In embodiment 2 and modification 1 of embodiment 2, the camera 306 and the near infrared ray light source 307 are configured to protrude from the housing 305, but when there is a blind spot in the outer periphery of the housing 305, the camera 306 and the near infrared ray light source 307 may be configured not to protrude, being disposed in the blind spot of the housing 305. Thus, the sense of presence of the camera 306 and the near infrared light source 307 can be reduced.

[ modification 2]

A display system 301a according to modification 2 of embodiment 2 will be described below with reference to fig. 19.

The display system 301a according to modification 2 of embodiment 2 is different from the display system 301 according to embodiment 2 in that the optical system L1a includes an emission section 358a in addition to the mirror 303a and the 1 st mirror 304, and light from the display surface 321 of the display 302 is reflected 3 times by the optical system L1a and emitted from the emission section 358 a. In the display system 301a according to modification 2 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

The display system 301a includes a mirror 303a instead of the half mirror 303 of the display system 301, and includes an emission portion 358a made of a half mirror instead of the emission portion 358 of the display system 301. The emission portion 358a has a function of transmitting a part of incident light and reflecting another part of the incident light. The output portion 358a is formed by a flat plate-like beam splitter having a light transmittance and a reflectance of about 50%.

In the display system 301a, the reflecting mirror 303a is disposed in the inner space S1 of the housing 305 on the lower wall 354 of the housing 305. Here, the reflecting mirror 303a is disposed obliquely below the display surface 321 of the display 302. The reflecting mirror 303a reflects the light from the display 302 toward the light emitting portion 358 a.

The light emitting portion 358a reflects light emitted from the display 302 and reflected by the mirror 303a toward the 1 st mirror 304, and transmits light reflected by the 1 st mirror 304. The emission portion 358a is disposed on the reflection surface 341 side of the 1 st mirror 304 at a position apart from the 1 st mirror 304. The emission portion 358a is arranged such that the distance between the 1 st mirror 304 and the upper end of the emission portion 358a is shorter than the distance between the 1 st mirror 304 and the lower end of the emission portion 358a in the direction in which the 1 st mirror 304 and the emission portion 358a are aligned, and is inclined with respect to a plane orthogonal to the direction in which the 1 st mirror 304 and the emission portion 358a are aligned. Accordingly, in the front-rear direction of vehicle 400 (see fig. 11), upper end of emission portion 358a is located forward of lower end of emission portion 358 a. In the display system 301a according to modification 2 of embodiment 2, similarly to the display system 301 according to embodiment 2, the emission direction of light from the emission portion 358a is along the imaging direction D1 of the camera 306.

The display system 301a according to modification 2 of embodiment 2 can extend the optical path length as compared with the display system 301 according to embodiment 2, and therefore can extend the distance from the eyes 501 of the observer 500 to the projection position of the virtual image.

The positions of the camera 306 and the 2 near infrared light sources 307 provided in the housing 305 of the display system 301a according to modification 2 of embodiment 2 are the same as those of the display system 301 according to embodiment 2, but the present invention is not limited thereto, and may be the same as those of any of examples 1 to 5 of modification 1 of embodiment 2.

[ modification 3]

A display system 301b according to example 1 of modification 3 of embodiment 2 will be described below with reference to fig. 20 and 21.

The display system 301b according to example 1 of modification 3 of embodiment 2 is different from the display system 301 according to embodiment 2 in that a1 st reflecting mirror 304b is provided instead of the 1 st reflecting mirror 304 of the display system 301 according to embodiment 2, and the camera 306 is an infrared camera, and the camera 306 is built in the housing 305 and is located on the opposite side of the emission portion 358 as viewed from the 1 st reflecting mirror 304 b. In the display system 301b according to example 1 of modification 3 of embodiment 2, an optical system L1b is configured, and in this optical system L1b, light from the display surface 321 of the display 302 is reflected 2 times by the half mirror 303 and the 1 st mirror 304 b. In the display system 301b according to example 1 of modification 3 of embodiment 2, the same components as those of the display system 301 according to embodiment 2 are given the same reference numerals, and description thereof is omitted.

The 1 st mirror 304b has a function of transmitting near infrared rays and reflecting visible light. In other words, the 1 st Mirror 304b is a Cold Mirror (Cold Mirror). The 1 st reflecting mirror 304b has a concave curved surface and a convex curved surface, and includes a glass plate that transmits near infrared rays, and a dielectric multilayer film that is formed on the concave curved surface of the glass plate, reflects visible light, and transmits near infrared rays. The reflecting surface 341b of the 1 st mirror 304b is formed by the surface of the dielectric multilayer film, and the surface 342b of the 1 st mirror 304b opposite to the reflecting surface 341b is formed by the convex curved surface of the glass plate.

In the display system 301b according to example 1 of modification 3 of embodiment 2, 2 near infrared light sources 307 are arranged around the camera 306. The 2 near-infrared light sources 307 are housed in the inner space S1 of the housing 305. The 2 near infrared light sources 307 are arranged in the left-right direction of the housing 305, and 1 near infrared light source is arranged on each of the left and right sides of the camera 306.

In the display system 301b according to example 1 of modification 3 of embodiment 2, the emission direction of the near infrared rays emitted from each of the 2 near infrared ray light sources 307 is along the imaging direction D1 of the camera 306. The near infrared rays emitted from the 2 near infrared ray sources 307 are transmitted through the 1 st mirror 304 and the emission portion 358, and are irradiated onto the face of the observer 500 (see fig. 11).

In the display system 301b according to example 1 of modification 3 of embodiment 2, similarly to the display system 301 according to embodiment 2, the emission direction of light from the emission portion 358 is along the imaging direction D1 of the camera 306. The camera 306 images the face of the observer 500 (see fig. 11) via the emission portion 358 and the 1 st mirror 304 b. In the display system 301b according to example 1 of modification 3 of embodiment 2, the camera 306 and the 2 near infrared light sources 307 are incorporated in the housing 305 and arranged on the surface 342b side of the 1 st reflecting mirror 304b, so that the projection can be eliminated when viewed from the observer 500 and the forward visual field can be not blocked as compared with embodiment 2.

Further, since the direction of the line of sight of the observer 500 coincides with the optical axis of the camera 306, the accuracy of detecting the viewpoint position and the line of sight of the observer 500 can be improved as compared with the case where the optical axes of the embodiments 2 do not coincide.

In addition, in example 1 of modification 3 of embodiment 2, since the camera 306 and the near infrared light source 307 are disposed on the back surface side of the 1 st reflecting mirror 304b when viewed from the observer 500, the presence feeling of these can be reduced.

A display system 301b according to example 2 of modification 3 of embodiment 2 will be described below with reference to fig. 22.

The display system 301b according to example 2 of modification 3 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that 2 near-infrared light sources 307 are arranged around the emission portion 358. In the display system 301b according to example 2 of modification 3 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301b according to example 2 of modification 3 of embodiment 2, the 2 near infrared light sources 307 are arranged at the center in the left-right direction of the lower surface of the lower wall 354 of the housing 305. The 2 near infrared light sources 307 are separated from each other in the left-right direction of the housing 305. The emission direction of the near infrared rays emitted from each of the 2 near infrared ray light sources 307 is along the imaging direction D1 of the camera 306.

In the display system 301b according to example 2 of modification 3 of embodiment 2, since the 2 near-infrared light sources 307 protrude downward from the housing 305, the amount of near-infrared light emitted from each near-infrared light source 307 can be reduced and the temperature rise of the housing 305 and the like can be suppressed, as compared with the case where the 2 near-infrared light sources 307 of the display system 301b according to example 1 of modification 3 of embodiment 2 are incorporated in the housing 305.

A display system 301b according to example 3 of modification 3 of embodiment 2 will be described below with reference to fig. 23.

The display system 301b according to example 3 of modification 3 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that 2 near-infrared light sources 307 are arranged around the emission portion 358. In the display system 301b according to example 3 of modification 3 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301b according to example 3 of modification 3 of embodiment 2, the 2 near infrared light sources 307 are arranged at the center in the left-right direction of the upper surface of the upper wall 353 of the housing 305. The 2 near infrared light sources 307 are separated from each other in the left-right direction of the housing 305. The emission direction of the near infrared rays emitted from each of the 2 near infrared ray light sources 307 is along the imaging direction D1 of the camera 306.

In the display system 301b according to example 3 of modification 3 of embodiment 2, since the 2 near infrared light sources 307 protrude upward from the housing 305, the amount of near infrared light emitted from each near infrared light source 307 can be reduced and the temperature increase of the housing 305 and the like can be suppressed, as compared with the case where the 2 near infrared light sources 307 of the display system 301b according to example 1 of modification 3 of embodiment 2 are incorporated in the housing 305. In the display system 301b according to example 3 of modification 3 of embodiment 2, since the 2 near infrared light sources 307 project upward from the frame body 305, the field of view of the observer 500 (see fig. 11) is less likely to be blocked by the 2 near infrared light sources 307.

A display system 301b according to example 4 of modification 3 of embodiment 2 will be described below with reference to fig. 24.

The display system 301b according to example 4 of modification 3 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that 2 near-infrared light sources 307 are arranged around the emission portion 358. In the display system 301b according to example 4 of modification 3 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

The display system 301b according to example 4 of modification 3 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that 2 near-infrared light sources 307 are disposed on the 1 st sidewall 355 and the 2 nd sidewall 356 of the housing 305, respectively. In the display system 301b according to example 4 of modification 3 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

The emission direction of the near infrared rays emitted from each of the 2 near infrared ray light sources 307 is along the imaging direction D1 of the camera 306.

In the display system 301b according to example 4 of modification 3 of embodiment 2, the view in front of the observer 500 is less likely to be blocked than in the case where the 2 near infrared light sources 307 of the display system 301b according to example 2 of modification 3 of embodiment 2 (see fig. 22) protrude downward from the lower wall 354 of the housing 305.

A display system 301b according to example 5 of modification 3 of embodiment 2 will be described below with reference to fig. 25.

The display system 301b according to example 5 of modification 3 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that 2 near-infrared light sources 307 are disposed on the 1 st side wall 355 of the housing 305. In the display system 301b according to example 5 of modification 3 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301b according to example 5 of modification 3 of embodiment 2, since the 2 near infrared light sources 307 project to the right from the housing 305, it is not necessary to enlarge the housing 305 itself.

In the display system 301b according to example 5 of modification 3 of embodiment 2, since the 2 near infrared light sources 307 are located closer to the face of the observer 500 (see fig. 11) that is the driver of the vehicle 400 (see fig. 11) on the right steering wheel than in the display system 301b according to example 2 of modification 3 of embodiment 2, it is advantageous for the near infrared light sources 307 to irradiate near infrared rays to the eyes 501 of the observer 500. When the present invention is applied to a vehicle with a left-hand steering wheel, the 2 near infrared light sources 307 are preferably provided on the 2 nd side wall 356 of the housing 305.

[ modification 4]

Next, a display system 301c according to modification 4 of embodiment 2 will be described with reference to fig. 26.

The display system 301c according to modification 4 of embodiment 2 differs from the display system 301b according to modification 3 of embodiment 2 in that the optical system L1c includes an emission section 358a in addition to the mirror 303a and the 1 st mirror 304b, and light from the display surface 321 of the display 302 is reflected 3 times by the optical system L1c and emitted from the emission section 358 a. In the display system 301c according to modification 4 of embodiment 2, the same components as those of the display system 301b according to modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

The display system 301c includes a mirror 303a instead of the half mirror 303 of the display system 301b, and includes an emission portion 358a made of a half mirror instead of the emission portion 358 of the display system 301 b. The emission portion 358a has a function of transmitting a part of incident light and reflecting another part of the incident light. The output portion 358a is formed by a flat plate-like beam splitter having a light transmittance and a light reflectance of about 50%.

In the display system 301c, the reflecting mirror 303a is disposed in the inner space S1 of the housing 305 on the lower wall 354 of the housing 305. Here, the reflecting mirror 303a is disposed obliquely below the display surface 321 of the display 302. The reflecting mirror 303a reflects the light from the display 302 toward the light emitting portion 358 a. The reflecting mirror 303a is a flat mirror that reflects visible light, but is not limited thereto, and may be a half mirror.

The light emitting portion 358a reflects light emitted from the display 302 and reflected by the mirror 303a toward the 1 st mirror 304b, and transmits light reflected by the 1 st mirror 304 b. The emission portion 358a is disposed on the reflection surface 341b side of the 1 st mirror 304b, separately from the 1 st mirror 304 b. The emission portion 358a is arranged to be inclined with respect to a plane orthogonal to the direction in which the 1 st mirror 304b and the emission portion 358a are arranged, such that the distance between the 1 st mirror 304b and the upper end of the emission portion 358a is shorter than the distance between the 1 st mirror 304b and the lower end of the emission portion 358a in the direction in which the 1 st mirror 304b and the emission portion 358a are arranged. Accordingly, in the front-rear direction of vehicle 400 (see fig. 11), upper end of emission portion 358a is located forward of lower end of emission portion 358 a. In the display system 301c according to modification 4 of embodiment 2, similarly to the display system 301 according to embodiment 2, the emission direction of light from the emission portion 358a is along the imaging direction D1 of the camera 306.

The display system 301c according to modification 4 of embodiment 2 can extend the optical path length as compared with the display system 301b according to modification 1 of embodiment 3 of embodiment 2, and therefore can extend the distance from the eyes 501 of the observer 500 to the projection position of the virtual image.

Further, as in example 1 of modification 3 of embodiment 2, since the direction of the line of sight of the observer 500 coincides with the optical axis of the camera 306, the accuracy of detecting the viewpoint position and the line of sight of the observer 500 can be improved as compared with the case of embodiment 2 in which the direction of the line of sight of the observer 500 does not coincide with the optical axis of the camera 306.

The positions of the camera 306 and the 2 near infrared light sources 307 provided in the housing 305 of the display system 301c according to modification 4 of embodiment 2 are the same as those of the display system 301b according to modification 1 of embodiment 3 of embodiment 2, but the present invention is not limited thereto, and may be the same as any of examples 1 to 5 of modification 3 of embodiment 2.

[ modification 5]

A display system 301d according to example 1 of modification 5 of embodiment 2 will be described below with reference to fig. 27A.

The display system 301d according to example 1 of modification 5 of embodiment 2 is different from the display system 301b according to example 1 of modification 3 of embodiment 2 in that a half mirror 303d is provided instead of the half mirror 303 of the display system 301b according to example 1 of modification 3 of embodiment 2. Further, in the display system 301d according to example 1 of modification 5 of embodiment 2, the camera 306 is arranged on the side opposite to the display 302 when viewed from the half mirror 303d in the direction in which the display 302 and the half mirror 303d are aligned. In other words, in the display system 301d, the camera 306 is disposed below the half mirror 303d, facing the half mirror 303d in the direction along the up-down direction. "opposite" here means that 2 faces are opposite to each other, and it is not necessary that 2 faces are parallel. In the display system 301d according to example 1 of modification 5 of embodiment 2, the same components as those of the display system 301b according to example 1 of modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

The half mirror 303d is a flat plate and has a1 st surface 331d facing the 1 st mirror 304 and a2 nd surface 332d facing the emission portion 358. The half mirror 303d has a function of transmitting visible light incident on the 2 nd surface 332d and reflecting near infrared rays. In other words, the half mirror 303d includes a glass plate having a1 st main surface and a2 nd main surface and transmitting visible light, and a dielectric multilayer film formed on the 2 nd main surface of the glass plate and transmitting visible light and reflecting near infrared rays. The 1 st principal surface of the glass plate constitutes the 1 st surface 331d of the half mirror 303d, and the 2 nd surface 332d of the half mirror 303d is constituted by the surface of the dielectric multilayer film.

The 1 st surface 331d of the half mirror 303d reflects light from the display surface 321 of the display 302 toward the 1 st mirror 304. The half mirror 303d transmits light reflected from the reflection surface 341 of the 1 st mirror 304 toward the half mirror 303 d. The 2 nd surface 332d of the half mirror 303d reflects the near infrared rays incident through the emission portion 358 downward. In the example shown in fig. 27A, the traveling path of the near infrared rays incident through the emission portion 358 is schematically shown by a broken line.

In the display system 301D according to example 1 of modification 5 of embodiment 2, the emission direction of light from the emission portion 358a is along the imaging direction D1 of the camera 306. Here, the image pickup direction D1 of the camera 306 is a direction in which the observer 500 (see fig. 11) is photographed via the half mirror 303D.

The display system 301d according to example 1 of modification 5 of embodiment 2 is configured to display an image such that light emitted from the emission portion 358 enters the eyes 501 (see fig. 11) of the observer 500, as in the display system 301 according to embodiment 2. Further, since the display system 301D has the camera 306 provided in the housing 305 in which the display 302, the half mirror 303, and the 1 st reflecting mirror 304 are built, and the imaging direction D1 of the camera 306 faces the vehicle interior 404 of the vehicle 400 (see fig. 11), it is not necessary to secure a mounting position and a mounting structure for mounting the camera 306 on the vehicle 400 in the vehicle 400, and it is possible to apply the display system to vehicles of various vehicle types.

Further, as in example 1 of modification 3 of embodiment 2 and modification 4 of embodiment 2, since the direction of the line of sight of the observer 500 coincides with the optical axis of the camera 306, the accuracy of detecting the viewpoint position and the line of sight of the observer 500 can be improved as compared with the case where the direction of the line of sight of the observer 500 does not coincide with the optical axis of the camera 306 in embodiment 2.

A display system 301d according to example 2 of modification 5 of embodiment 2 will be described below with reference to fig. 27B.

The display system 301d according to example 2 of modification 5 of embodiment 2 is different from the display system 301d according to example 1 of modification 5 of embodiment 2 in the arrangement of the near infrared light sources 307. In the display system 301d according to example 2 of modification 5 of embodiment 2, the camera 306 is disposed on the emission portion 358 side of the housing 305 and below the half mirror 303d, and faces the half mirror 303d in the direction along the vertical direction, similarly to the display system 301d according to example 1 of modification 5 of embodiment 2. Here, "opposite" means that 2 faces are opposite to each other, and it is not necessary that the 2 faces are parallel. In the display system 301d according to example 2 of modification 5 of embodiment 2, the same components as those of the display system 301d according to example 1 of modification 5 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301d according to example 2 of modification 5 of embodiment 2, the near infrared light source 307 is provided on the rear wall 352 of the housing 305 and is disposed apart from the camera 306 in the front-rear direction (in other words, the left-right direction of the paper). The near infrared light source 307 emits near infrared light to the outside of the housing 305 along the imaging direction D1 of the camera.

Both the camera 306 and the near infrared light source 307 are functional modules that generate heat during operation, and when these components are disposed close to each other, heat generation may be promoted, which may cause module failure due to thermal failure. Further, the influence of high heat also affects the respective members constituting the optical system, such as the half mirror 303d and the output unit 358, and may cause distortion in the optical system, resulting in deterioration of the display system 301 d.

In the present example, as described above, the camera 306 and the near-infrared light source 307 are arranged apart in the front-rear direction, and such thermal obstacles can be suppressed. Further, the emission direction of the near infrared rays from the near infrared ray light source 307 can be brought close to the imaging direction D1 of the camera 306 by being arranged at a distance in the front-rear direction. In other words, the modules are arranged separately from each other, suppressing thermal failure, and the separate arrangement can suppress deterioration in quality of image pickup by the camera 306.

The same effect can be obtained also when the arrangement of the near infrared light source 307 and the camera 306 is changed as described above. In other words, the configuration in which the near infrared light source 307 is disposed below the half mirror 303d, faces the half mirror 303d in the vertical direction, and the camera 306 is provided on the rear wall 352 of the housing 305 and shoots the outside of the housing 305 can also suppress both thermal failure and degradation of image quality.

[ modification 6]

A display system 301e according to modification 6 of embodiment 2 will be described below with reference to fig. 28 to 30. The display system 301e according to modification 6 of embodiment 2 is different from the display system 301b according to modification 1 of embodiment 3 of embodiment 2 in that it further includes a mirror member 900. Note that, in the display system 301e according to modification 6 of embodiment 2, the same components as those in the display system 301b according to modification 3 of embodiment 2 are given the same reference numerals, and description thereof is omitted.

In the display system 301e according to modification 6 of embodiment 2, the opening in the rear wall of the housing 305 forms the light emitting section 358 e.

The mirror member 900 is provided in the housing 305, and has a reflecting surface 901 that reflects visible light. The mirror member 900 is flat and has a light shielding surface 902 for shielding visible light on the side opposite to the reflecting surface 901.

The mirror member 900 is movably attached to the housing 305 between a1 st position (position shown in fig. 28) and a2 nd position (position shown in fig. 30). The 1 st position is a position outside the optical path of light that is emitted from the display surface 321 of the display 302, reflected by the half mirror 303, and reflected by the 1 st mirror 304 b. More specifically, the 1 st position is a position above the lower wall 354 of the housing 305 and adjacent to the lower wall 354, and is a position not overlapping the half mirror 303 in the front-rear direction of the housing 305 and substantially parallel to the lower wall 354. Here, the substantial parallel includes a case where an angle (acute angle) formed by the mirror member 900 at the 1 st position and the lower wall 354 is 10 degrees or less when viewed from the side of the display system 301e shown in fig. 28. The 2 nd position is a position on the optical path of light that is emitted from the display surface 321 of the display 302, reflected by the half mirror 303, and reflected by the 1 st mirror 304 b. More specifically, the 2 nd position is a position overlapping the emission portion 358e when viewed from the 1 st mirror 304b, that is, a position on the opposite side of the 1 st mirror 304b when viewed from the half mirror 303, and a position where the reflection surface 901 faces the emission portion 358 e. In other words, in the mirror member 900 located at the 2 nd position, the reflection surface 901 is located on the opposite side to the half mirror 303 side, and the light shielding surface 902 is located on the half mirror 303 side. When an observer 500, which is a driver, sits on the driver seat 430 of the vehicle 400, the mirror member 900 located at the 2 nd position is located between the half mirror 303 and the observer 500, and the reflection surface 901 of the mirror member 900 is located on the observer 500 side.

The mirror member 900 has a rectangular shape when viewed in the thickness direction thereof. The mirror member 900 is set to have the same dimensions in the left-right direction and the up-down direction in the state of being disposed at the 2 nd position as the apparent dimensions when the half mirror 303 is viewed from the position of the eye 501 of the observer 500. Therefore, in the 2 nd state in which the mirror member 900 is disposed at the 2 nd position, the entire half mirror 303 is covered with the mirror member 900 when viewed from the observer 500. In the 2 nd state, it is not essential that the whole of the half mirror 303 is covered with the mirror member 900 when viewed from the observer 200, and a part of the half mirror 303 can be seen by the observer 500.

In the display system 301e, the observer 500 can view the reflected image by reflecting light from the rear of the vehicle 400 on the mirror member 900 by adjusting the orientation of the housing 305 by the adjustment mechanism of the support member 372 in a state where the mirror member 900 is disposed at the 2 nd position.

The light-shielding surface 902 of the mirror member 900 has a lower reflectance to visible light than the reflection surface 901. More specifically, the mirror member 900 has a function of absorbing light incident on the light shielding surface 902. The light shielding surface 902 is darker in color, for example, black, than the inner surface of the ceiling portion 401 of the main body 410 of the vehicle 400. In a state where the mirror member 900 is disposed at the 1 st position, the light shielding surface 902 of the mirror member 900 faces the half mirror 303. In the display system 301e, since the mirror member 900 has a function of absorbing light incident on the light shielding surface 902, light incident on the light shielding surface 902 of the mirror member 900 from the outside of the housing 305 can be suppressed from being reflected on the light shielding surface 902 in a state where the mirror member 900 is disposed at the 1 st position. Accordingly, in the display system 301e, the light incident on the light shielding surface 902 from the outside of the housing 305 can be reflected by the light shielding surface 902 and the half mirror 303, and can be prevented from being incident on the eye 501 of the observer 500, whereby the contrast of the image displayed by the display system 301 can be improved.

On the left and right edges of the mirror member 900, a1 st projection 941 and a2 nd projection 942 are provided, respectively. When the mirror member 900 is located at the 1 st position, the 1 st projection 94 among the 1 st projection 941 and the 2 nd projection 942 is located on the front side and the 2 nd projection 942 is located on the rear side in the front-rear direction. Further, when the mirror member 900 is located at the 2 nd position, the 1 st projection 94 among the 1 st projection 941 and the 2 nd projection 942 is located at the lower side and the 2 nd projection 942 is located at the upper side in the up-down direction.

On the surfaces of the 1 st and 2

nd side walls

355 and 356 facing each other in the housing 305, a1 st guide groove 971 and a2 nd guide groove 972 are provided, the 1 st guide groove 971 guides the 1 st projection 941 to move the 1 st projection 941 in the front-rear direction of the housing 305, and the 2 nd guide groove 972 guides the 2 nd projection 942 to move the 2 nd projection 942 in the up-down direction of the housing 305. The 1 st guide groove 971 is provided along the front-rear direction of the housing 35 on a surface of the housing 305 where the 1 st side wall 355 and the 2 nd side wall 356 face each other. The 2 nd guide groove 972 is provided along the vertical direction of the housing 35 on a surface of the housing 305 where the 1 st side wall 355 and the 2 nd side wall 356 face each other.

As shown in fig. 28, in the 1 st state where the mirror member 900 is located at the 1 st position, the 1 st projection 941 is located near the front end of the inside of the 1 st guide groove 971, and the 2 nd projection 942 is located near the lower end of the inside of the 2 nd guide groove 972. Accordingly, the mirror member 900 is disposed along the upper surface of the lower wall 354 of the housing 305, and is disposed outside the optical path of the light that is transmitted through the half mirror 303 and enters the eye 501 of the observer 500. Therefore, when the state of the mirror member 900 is the 1 st state, the observer 900 can see an image which is enlarged and made into a telescopic point by reflecting the image displayed on the display surface 321 of the display 302 by the optical system L1. In the state where the mirror member 900 is disposed at the 1 st position, for example, the end of the mirror member 900 is locked by a hook or the like provided on the housing 305, and the mirror member 900 is held in the 1 st state.

The display system 301e further includes a protruding piece 903, and the protruding piece 903 is an operation portion for manually switching the state of the mirror member 900 between the 1 st state and the 2 nd state. A protruding piece 903 provided integrally with the mirror member 900. The protruding piece 903 protrudes obliquely downward in a state where the mirror member 900 is located at the 1 st position.

The observer 500 or the like can move the mirror member 900 by pushing or pulling the protrusion 903 serving as the operation portion upward or downward with a finger.

When the user pushes the protruding piece 903 of the mirror member 900 in the 1 st state upward, as shown in fig. 29, the 1 st projection 941 slides rearward in the 1 st guide groove 971, and the 2 nd projection 942 slides upward in the 2 nd guide groove 972.

When the mirror member 900 is moved to the 2 nd position, as shown in fig. 30, the 1 st projection 941 is positioned near the rear end of the inside of the 1 st guide groove 971, and the 2 nd projection 942 is positioned near the upper end of the inside of the 2 nd guide groove 972. In the 2 nd state where the mirror member 900 is disposed at the 2 nd position, the mirror member 900 is disposed in the up-down direction with the reflecting surface 901 facing the opposite side of the half mirror 303. The arrangement along the vertical direction is not limited to the arrangement along the vertical direction, and the observer 500 may be arranged in a state inclined with respect to the vertical direction if the observer can visually recognize the rear side of the vehicle 400 through the reflection surface 901. In the 2 nd state in which the mirror member 900 is disposed at the 2 nd position, for example, the end of the mirror member 900 is locked by a hook or the like provided on the housing 305, and the mirror member 900 maintains the 2 nd state.

In the 2 nd state, the observer 500 can see a reflected image of the light a21 reflected by the reflecting surface 901 from the outside of the housing 305 (for example, the rear of the vehicle 400). In the 2 nd state, the light reflected by the 1 st mirror 304 and transmitted through the half mirror 303 is blocked by the mirror member 900, and therefore the observer 500 cannot see the image displayed on the display surface 321 of the display 302.

When the state of the mirror member 900 is switched from the 2 nd state to the 1 st state, for example, the observer 500 pulls down the protruding piece 903 of the mirror member 900. When the protrusion 903 is pulled down, the 1 st projection 941 moves forward inside the 1 st guide groove 971, and the 2 nd projection 942 moves downward inside the 2 nd guide groove 972, whereby the state of the mirror member 900 is switched from the 2 nd state to the 1 st state. When the state of the mirror member 900 is switched to the 1 st state, the observer 500 can see a reflected image in which the image on the display surface 321 of the display 302 is reflected by the optical system L1 b.

The display system 301e includes an actuator 905, and the actuator 905 is a driving unit for moving the mirror member 900 between the 1 st position and the 2 nd position. The control unit 308 is electrically connected to the actuator 905.

The actuator 905, for example, includes an electric motor. Here, an output shaft of the motor is coupled to a worm gear (worm gear). A part of the worm wheel is exposed in the 1 st guide groove 971. In this case, the shape of the 1 st protrusion 941 is a pinion (pinion gear) engaged with the worm wheel. The 1 st projection 941 is fixed to the mirror member 900, and when the control unit 308 controls the actuator 905 to rotate the worm wheel, the 1 st projection 941 moves in the 1 st guide groove 971 in accordance with the rotation of the worm wheel. Further, the 1 st protrusion 941 moves in the 1 st guide groove 971, so that the mirror member 900 moves between the 1 st position and the 2 nd position. The actuator 905 is not limited to a motor, and may be a solenoid or the like that drives a mechanism for moving the mirror member 900 from the 1 st position to the 2 nd position.

The control unit 308 detects the distance between the emission unit 358 and the face of the observer 500 based on the image captured by the camera 306, for example, and controls the actuator 905 such that the mirror member 900 is set to the 1 st position when the distance is greater than a predetermined distance, and the mirror member 900 is set to the 2 nd position when the distance is equal to or less than the predetermined distance. Accordingly, in the display system 301e, when the observer 500 brings the face close to the mirror member 900, the sunlight can be prevented from being concentrated to the eyes of the observer 500 by the mirror member 900. The distance between the emission part 358 and the face of the observer 500 can be determined by, for example, the distance between 2 eyes 501 of the observer 500 in the image of the observer 500 captured by the camera 306, the focal distance of the autofocus of the camera 306, and the like.

When an abnormality signal indicating an abnormality is inputted from the display 302, for example, the control unit 308 controls the actuator 905 to move the mirror member 900 from the 1 st position to the 2 nd position. Accordingly, when an abnormality occurs in the display of the display 302, the mirror member 900 is disposed at the 2 nd position, and therefore the observer 500 can see the reflected image reflected on the reflection surface 901 of the mirror member 900. Therefore, the display system 301e can replace the display even when an abnormality occurs in the display of the display 302.

Further, when a notification signal indicating that the display of the display 302 has been restored is input from the display 302, for example, the control unit 308 can control the actuator 905 to move the mirror member 900 to the 1 st position. Thus, in a case where the display of the display 302 has been restored, the observer 500 can see the image displayed by the display 302 via the optical system L1 b.

The display system 301e may further include a detection switch for detecting a state in which the mirror member 900 is disposed at the 2 nd position. In this case, when the detection switch detects that the mirror member 900 is disposed at the 2 nd position, the control unit 308 can stop the display on the display 302 based on the detection result of the detection switch.

[ other modifications ]

The above embodiment 2 is merely an example of various embodiments of the present disclosure. Embodiment 2 can be modified in various ways according to design and the like as long as the above-described object is achieved.

For example, the lens of the camera 306 may be configured by a wide-angle lens in the display system 301, so that the occupant seat 435 (see fig. 31) in the vehicle interior 404 can be photographed by the camera 306. In this case, the occupant 600 seated in the occupant seat 435 can be monitored by the display system 301 (see fig. 31).

The control unit 308 extracts an image of the occupant of the rear seat of the vehicle 400 from the captured image of the camera 306, superimposes the image on the video image from the imaging unit 309, and displays the superimposed image on the display 302.

Further, the controller 308 may display an image P2 (see fig. 32B) of an interior (e.g., a window pillar behind a rear seat) of the vehicle 400 on the display 302 by superimposing the image P1 (see fig. 32A) from the image pickup unit 309, as shown in fig. 32C, for example. The image of the interior can be stored in advance in, for example, a memory or the like included in the control unit 308. In addition, the interior trim is not limited to the window pillar, and may include at least a portion of a rear seat of the vehicle 400, for example.

The half mirror 303 described in embodiment 2 may be a generally used half mirror, similar to the half mirror 113 in embodiment 1.

[ conclusion ]

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 1 of the present embodiment described above is provided with a display (302), a half mirror (303; 303 d; a mirror 303a), a1 st mirror (304; 304b), a housing (305), and a camera (306). The display (302) has a display surface (321) that displays an image behind the vehicle (400). A half mirror (303; 303 d; and a mirror 303a) that reflects light emitted from the display (302). And a1 st mirror (304; 304b) for reflecting the light reflected by the half mirror (303; 303 d; mirror 303 a). A housing (305) houses a display (302), a half mirror (303; 303 d; a mirror 303a), and a1 st mirror (304; 304 b). And a camera (306) provided in the housing (305). The housing (305) has an emission section (358; 358 a; 358e) that emits light reflected by the 1 st mirror (304; 304 b). In the display system (301; 301 a; 301 b; 301 c; 301 d; 301e), light emitted from the emission section (358; 358 a; 358e) enters the eyes (501) of an observer (500) to display an image. The imaging direction (D1) of the camera (306) faces the interior (404) of the vehicle (400).

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 1 of the present embodiment has an advantage that it can be applied to vehicles of various types.

According to the display system (301; 301 a; 301 b; 301 c; 301D; 301e) of claim 2 of the present embodiment, the emission direction of light from the emission part (358) is along the imaging direction (D1) of the camera (306).

In the display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 2 of the present embodiment, the angle of view of the camera (306) can be narrowed without requiring an extra margin. Thus, for example, when the eye 501 of the observer 500 is detected, the detection accuracy of the eye 501 can be improved.

According to the display system (301; 301 a; 301 b; 301 c; 301D; 301e) according to claim 3 of the present embodiment, the imaging direction (D1) of the camera (306) faces the headrest (431) of the driver seat (430) in the vehicle interior (404).

According to the display system (301; 301 a; 301 b; 301 c; 301D; 301e) according to claim 4 of the present embodiment, the imaging direction (D1) of the camera (306) faces the occupant seat in the vehicle (404) according to claim 1.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 4 of the present embodiment is capable of monitoring an occupant (600) of a vehicle (400).

According to the display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 5 of the present embodiment, the camera (306) is located around the emission portion (358; 358 a; 358e) according to any one of the above-described claims 1 to 4.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 5 of the present embodiment can reduce the possibility that the frame body (305) blocks the front view of the observer (500) without enlarging the frame body (305) itself.

The display system (301; 301 a; 301d) according to claim 6 of the present embodiment further includes a near-infrared light source (307) disposed around the emission portion (358; 358a) according to claim 5. The emission direction of near infrared rays from the near infrared ray light source (307) is along the imaging direction (D1) of the camera (306).

The display system (301; 301 a; 301d) according to claim 6 of the present embodiment enables the camera (306) to perform imaging even at dark hours such as at night.

In the display system (301 b; 301 c; 301e) according to claim 7 of the present embodiment, the 1 st mirror (304b) has a function of transmitting near infrared rays and reflecting visible rays according to any one of the above-described aspects 1 to 3. And a camera (306) which is built in the housing (305) and is positioned on the opposite side of the light emitting section (358; 358a) when viewed from the 1 st mirror (304 b).

In the display system (301 b; 301 c; 301e) according to claim 7 of the present embodiment, the field of view of the observer (500) is not blocked by the near-infrared light source (307).

The display system (301 b; 301 c; 301e) according to claim 8 of the present embodiment further includes, according to the above-mentioned claim 7, a near-infrared light source (307) disposed around the emission portion (358; 358 a). The emission direction of near infrared rays from the near infrared ray light source (307) is along the imaging direction (D1) of the camera (306).

The display system (301 b; 301 c; 301e) according to claim 8 of the present embodiment enables the camera (306) to take an image even when it is dark at night or the like.

The display system (301; 301a) according to claim 9 of the present embodiment further includes, according to the above-mentioned claim 7, a near-infrared light source (307) disposed around the emission portion (358; 358 a). The emission direction of near infrared rays from the near infrared ray light source (307) is along the imaging direction (D1) of the camera (306).

The display system (301; 301a) according to claim 9 of the present embodiment can capture an image of an observer (500) by a camera (306) even at dark hours such as at night.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 10 of the present embodiment further includes a control unit (308) according to any one of the above-described claims 1 to 9. And a control unit (308) electrically connected to the display (302) and the camera (306). And a control unit (308) that detects a value or displacement of at least one of the face position, the viewpoint position, and the line-of-sight direction in the image of the observer (500) captured by the camera (306), and changes at least one of the position and the size of the image on the basis of the detected value or displacement.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 10 of the present embodiment is capable of moving, enlarging, reducing, etc. an image.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 11 of the present embodiment further includes a control unit (308) according to any one of the above-described 1 st to 3 rd aspects and 7 th to 9 th aspects. And a control unit (308) electrically connected to the display (302) and the camera (306). And a control unit (308) that detects the viewpoint position of the observer (500) on the basis of the image of the observer (500) captured by the camera (306), and that issues a warning signal when it is determined that the viewpoint position is displaced from the predetermined window.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 11 of the present embodiment issues a warning signal when the viewpoint position of the observer (500) is displaced from a predetermined window.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 12 of the present embodiment further includes a mirror member (900), an actuator (905), and a control unit (308) according to any one of the above-described claims 1 to 9. The mirror member (900) is provided in the housing (305) and has a reflection surface (901) for reflecting visible light. And a control unit (308) electrically connected to the display (302), the camera (306), and the actuator (905). The mirror member (900) is movable between a1 st position and a2 nd position, wherein the 1 st position is a position outside the optical path of the light reflected by the 1 st mirror (304; 304b), and the 2 nd position is a position on the optical path and overlaps the emission section (358e) when viewed from the 1 st mirror (304; 304 b). And a control unit (308) that detects the distance between the emission unit (358) and the face of the observer (500) on the basis of the distance in the image captured by the camera (306), and controls the actuator (905) such that the mirror member (900) is positioned at the 1 st position when the distance is greater than a predetermined distance, and the mirror member (900) is positioned at the 2 nd position when the distance is less than or equal to the predetermined distance. In the 2 nd position, the reflecting surface 901 of the mirror member 900 is positioned on the viewer 500 side.

In the display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 12 of the present embodiment, when the face of the observer (500) approaches the mirror member (900), sunlight can be suppressed from being reflected by the mirror member (900) and condensed on the observer (500).

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 13 of the present embodiment further includes a control unit (308) according to any one of the above-described claims 1 to 9. And a control unit (308) electrically connected to the display (302) and the camera (306). And a control unit (308) that extracts an image of the occupant of the rear seat of the vehicle (400) from the image captured by the camera (306), and superimposes the image on the video image to display the image on the display (302).

In the display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 13 of the present embodiment, an observer (500) can visually confirm the appearance of the occupant in the rear seat.

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 14 of the present embodiment further includes a driving unit (support member 372) and a control unit (308) according to any one of the above-described 1 st to 11 th aspects. A drive unit for changing the emission direction of the light from the emission unit (358; 358a) by driving the housing (305). And a control unit (308) electrically connected to the drive unit, the display (302), and the camera (306). And a control unit (308) which detects the viewpoint position of the observer (200) on the basis of the image of the observer (500) captured by the camera (306), and controls the drive unit so as to be driven in accordance with the viewpoint position frame (305).

The display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 14 of the present embodiment enables imaging by the camera (306) even if the viewpoint position of the observer (500) moves. In the display system (301; 301 a; 301 b; 301 c; 301 d; 301e) according to claim 14 of the present embodiment, light emitted from the light emitting section (358) of the housing (305) can be made to follow the viewpoint direction of the observer (500).

(embodiment mode 3)

Next, a display system in which the observer can easily grasp the distance between the host vehicle and the vehicle behind the host vehicle when viewing the displayed image will be described in addition to the above.

A conventionally known display device for a vehicle includes: a display that displays an image, a reflection unit that reflects the image displayed on the display, and a concave mirror that reflects the image reflected by the reflection unit (patent document 3). In the vehicle display device described in patent document 3, the reflection unit transmits an image reflected by the concave mirror. The concave mirror has a center of curvature disposed on an optical axis between the display and a viewpoint of a vehicle occupant.

In the vehicle display device described in patent document 3, it is difficult for an observer who sees an image to grasp the distance between the vehicle and a vehicle behind the vehicle.

An object of embodiment 3 described below is to provide a display system that facilitates an observer to grasp an interval between the vehicle and a vehicle behind the vehicle when viewing a displayed image, and that displays an image appropriately.

As an example, the display system of the present embodiment includes a display, a2 nd mirror, and a1 st mirror. The display has a display surface on which an image of the rear of the vehicle is displayed. The 2 nd mirror has a planar reflecting surface and directly reflects light emitted from the display. The 1 st reflecting mirror reflects at least the light reflected by the 2 nd reflecting mirror. The display system further includes an interior display unit. The interior display part is integrally provided with the 2 nd reflecting mirror and is directly or indirectly positioned on the reflecting surface. The interior display unit displays an interior pattern corresponding to at least a part of an interior of the vehicle rear portion. In the display system, the light reflected by the 1 st mirror is incident on the eyes of the observer as light overlapping the interior pattern, and the image and the interior pattern are displayed.

With this configuration, the display system according to the present embodiment has an advantage in that the observer can easily grasp the distance between the vehicle and the vehicle behind the observer when viewing the displayed image.

Fig. 33 to 41 described in the following embodiments and the like are conceptual diagrams, and the ratios of the sizes and thicknesses of the respective components in the diagrams are not limited to reflect actual dimensional ratios.

[ summary ]

As shown in fig. 33, a display system 1001 according to embodiment 3 is a system used for a vehicle (automobile) 1100, which is a mobile object, for example.

The display system 1001 is mounted on a moving body main body of a moving body. The mobile body main body of the mobile body is a main body (vehicle body) 1110 of the vehicle 1100.

The display system 1001 includes a display 1002, a2 nd mirror 1003, and a1 st mirror 1004. The display system 1001 further includes a housing 1005.

The display 1002 has a display surface 1021, and the display surface 1021 displays an image of the rear of the vehicle 1100. The image is output from, for example, an imaging unit 1090 (see fig. 34) that captures the rear of the vehicle 1100. The imaging unit 1090 is mounted on the main body 1110 of the vehicle 1100. The display system 1001 and the imaging unit 1090 according to embodiment 3 constitute an electronic mirror system 1010. The mobile body includes an electronic mirror system 1010 and a main body 1110 on which the electronic mirror system 1010 is mounted.

The 2 nd mirror 1003 has a reflection surface 1031, and the reflection surface 1031 is a planar reflection surface that reflects light emitted from the display 1002. The 1 st mirror 1004 reflects the light reflected by the 2 nd mirror 1003. Housing 1005 houses display 1002, 2 nd mirror 1003, and 1 st mirror 1004. The housing 1005 has an output portion 1058 for outputting the light reflected by the 1 st mirror 1004. In the display system 1001, when an image of the rear side of the vehicle is displayed on the display surface 1021, the image reflected by the 2 nd mirror 1003 and the 1 st mirror 1004 is output from the output unit 1058.

In the display system 1001, light emitted from the emission unit 1058 enters the eyes of the observer 1200, and an image is displayed. Accordingly, the observer 1200 can see an image based on the light emitted from the display surface 1021 of the display 1002. Observer 1200 is, for example, a driver of vehicle 1100.

The display system 1001 further includes an interior display unit 1009. The interior display portion 1009 is provided integrally with the 2 nd mirror 1003, and is positioned on the reflection surface 1031 of the 2 nd mirror 1003. Therefore, the interior display portion 1009 is built in the housing 1005. The interior display unit 1009 displays an interior pattern corresponding to at least a part of an interior of the rear portion of the vehicle 1100.

The housing 1005 of the display system 1001 is disposed at a front portion of the ceiling portion 1101 of the main body 1110 near the windshield 1102 (front window), and is located at a position where the observer 1200 seated in the driver seat 1130 enters the field of view of the observer 1200 in a state where the observer is facing forward (see fig. 33). In addition, the face of the observer 1200 is located in front of the headrest 1131 of the driving seat 1130.

[ constitution ]

The display system 1001 according to embodiment 3 includes the display 1002, the 2 nd mirror 1003, the 1 st mirror 1004, the housing 1005, and the interior display unit 1009 as described above.

The display 1002 is housed in a housing 1005. The display 1002 is located above the inner space S1 of the housing 1005. The display 1002 is housed in the housing 1005 with the display surface 1021 facing downward. The display 1002 outputs light forming an image of an image. The Display 1002 includes, for example, a light source device and a Liquid Crystal panel (LCD). And a liquid crystal panel disposed in front of the light source device. The light source device is used as a backlight of a liquid crystal panel. The light source device is a so-called surface light source. The light source device is a side-light type light source device using a solid-state light emitting element such as a light emitting diode or a laser diode. Light from the light source device passes through the liquid crystal panel and is emitted from the display surface 1021 of the display 1002. An image is formed by light emitted from the display surface 1021 of the display 1002. The light output from the display surface 1021 is light reflecting an image displayed on the liquid crystal panel. Fig. 33 and 34 show in a broken line pattern the travel path of light output from one point (a certain pixel point) of an image P1 (see, for example, fig. 36A) displayed on the display surface 1021 of the display 1002.

The display system 1001 according to embodiment 3 includes a2 nd mirror 1003 and a1 st mirror 1004 as a reflecting member that reflects light emitted from the display surface 1021 of the display 1002. That is, the display system 1001 has an optical system (reflection optical system) including a2 nd mirror 1003 and a1 st mirror 1004.

The 2 nd mirror 1003 directly reflects light emitted from the display 1002. Here, "direct reflection" means that light emitted from the display 1002 and incident on the reflection surface 1031 without being reflected for 1 time by another member is reflected. The 2 nd mirror 1003 reflects light emitted from the display 1002 and incident on the reflection surface 1031, toward the 1 st mirror 1004. The 2 nd mirror 1003 is disposed below the display surface 1021 of the display 1002. The reflection surface 1031 of the 2 nd mirror 1003 faces the display surface 1021 of the display 1002. Here, "opposed" means that the display surface 1021 and the reflection surface 1031 are opposed to each other, and it is not necessary that the display surface 1021 and the reflection surface 1031 are parallel.

The 2 nd mirror 1003 includes, for example, a plane mirror main body and a reflection film provided on a surface of the plane mirror main body. The material of the flat mirror body includes, for example, glass. The material of the reflective film is preferably a metal having high reflectivity with respect to visible light, and includes aluminum, for example. In the 2 nd mirror 1003, a surface of the reflection film constitutes a reflection surface 1031.

The 1 st reflecting mirror 1004 includes, for example, a concave mirror body and a reflecting film provided on a surface of the concave mirror body. The material of the concave mirror body includes, for example, glass. The material of the reflective film is preferably a metal having high reflectivity with respect to visible light, and includes aluminum, for example. In the 1 st mirror 1004, the surface of the reflection film constitutes a reflection surface 1041.

In an optical system L1 including the 2 nd mirror 1003 and the 1 st mirror 1004, light emitted from the display surface 1021 of the display 1002 is reflected on the reflection surface 1031 of the 2 nd mirror 1003 toward the 1 st mirror 1004. The reflection surface 1041 of the 1 st mirror 1004 reflects the light from the 2 nd mirror 1003.

In the display system 1001, the housing 1005 includes an emission unit 1058, and the emission unit 1058 emits the light reflected by the 1 st mirror 1004. The emission section 1058 transmits visible light. Accordingly, in the display system 1001, the light emitted from the emission unit 1058 enters the eyes 1201 of the observer 1200, and the observer 1200 can see an image based on the image displayed on the display surface 1021 of the display 1002. That is, the observer 1200 can see the images reflected by the 2 nd mirror 1003 and the 1 st mirror 1004 of the optical system L1. Therefore, in the direction in which the reflection surface 1041 of the 1 st mirror 1004 is viewed through the emission unit 1058, the image that the observer 1200 sees the display 1002 appears to be displayed at a display position that is farther than the reflection surface 1041 (for example, 1m to 3m ahead from the viewpoint of the observer 1200). In other words, the image of the display 1002 becomes a virtual image. This is advantageous in that the observer 1200 can easily adjust the focus when looking at the image (virtual image) displayed by the display system 1001 from the state of looking at the front field of view through the windshield 1102.

The housing 1005 includes a main body 1050 and an emission portion 1058. The main body 1050 has a box shape having a front wall 1051, a rear wall 1052, an upper wall 1053, a lower wall 1054, and a pair of side walls (a right side wall and a left side wall when viewed from the viewer 1200), and having an opening 1521 (through hole) in the rear wall 1052, and the main body 1050 has an inner space S1. The material of the frame 1005 includes resin. The opening 1521 is rectangular, the opening width in the left-right direction is larger than the opening width in the up-down direction, and the ratio of the opening width in the left-right direction to the opening width in the up-down direction is about 3 to 6: 1. the light emitting unit 1058 is a flat plate having a rectangular outer peripheral shape, and is disposed so as to cover the opening 1521 of the rear wall 1052. In a state where frame 1005 is attached to body 1110 of vehicle 1100, the dimension in the lateral direction (vehicle width direction) of body 1110 is larger than both the dimension in the vertical direction and the dimension in the front-rear direction. The light emitting section 1058 functions as a dust cover for preventing dust and the like from entering the inner space S1 of the housing 1005. The light emitting unit 1058 is, for example, a transparent plate that transmits visible light. The transparent plate, for example, formed of glass, has transparency. The term "transparent" as used herein means that the transmittance to visible light is 50% or more, preferably 70% or more and 90% or more. The transparent plate is not limited to glass, and may be formed of a resin such as an acryl resin, for example. The emission unit 1058 is not limited to the transparent plate, and may be a liquid crystal mirror.

The housing 1005 is attached to a front portion of the ceiling portion 1101 of the main body 1110 near the windshield 1102, and is disposed at a position where the observer 1200 enters the field of view, and the observer 1200 sits on a front seat such as a driver seat 1130 (see fig. 34). The housing 1005 is attached to the ceiling portion 1101 of the main body 1110 via a support member 1072, and is suspended from the ceiling portion 1101. Here, the frame 1005 is disposed at a position not obstructing the front view of the observer 1200. The support member 1072 has an adjustment mechanism (e.g., a ball joint) for adjusting the orientation of the housing 1005. Moreover, the housing 1005 is not limited to the case of being attached to the ceiling portion 1101, and may be attached to the windshield 1102, for example.

The display system 1001 further includes a control unit 1008. The control unit 1008 is electrically connected to the display 1002. The control unit 1008 controls the state of the display image on the display 1002. The control unit 1008 communicates (wired communication or wireless communication) with the image pickup unit 1090 via, for example, an in-vehicle network of the vehicle 1100. Image data of a captured image behind vehicle 1100 is input from imaging unit 1090 to control unit 1008. The control unit 1008 causes the display 1002 to display an image based on the captured image input from the imaging unit 1090. Here, the image based on the captured image may be the captured image itself or may be an image obtained by image processing the captured image. For example, since the image captured by the image capturing unit 1090 is dark at night, the image captured by the image capturing unit 1090 can be subjected to luminance correction. Further, a CG (computer graphics) image, a mark, or the like showing an obstacle or the like reflected in the image may be created based on the image captured by the imaging unit 1090, or an image in which the CG image, the mark, or the like is superimposed on the image captured by the imaging unit 1090 may be displayed on the display surface 1021 of the display 1002. Further, an image in which a mark indicating driving support information (for example, vehicle speed information, navigation information, pedestrian information, preceding vehicle information, lane departure information, vehicle state information, and the like) is superimposed on the image captured by the image capturing unit 1090 may be displayed on the display 1002.

The control unit 1008 includes a computer system. The computer system is mainly composed of a processor and a memory as hardware. The function of the control unit 1008 is realized by the processor executing a program recorded in the memory of the computer system. The program may be recorded in advance in a memory of the computer system, may be provided via an electric communication line, or may be recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that is readable by the computer system. A processor of a computer system is constituted by 1 or more electronic circuits including a semiconductor Integrated Circuit (IC) or a large scale integrated circuit (LSI). The integrated circuits such as IC and LSI have different names depending on the degree of Integration, and may include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ulsi (ultra Large Scale Integration). Furthermore, an FPGA (Field-Programmable Gate Array) programmed after the manufacture of the LSI, or a logic device capable of reconstructing a connection relationship within the LSI or reconstructing a circuit region within the LSI may be used as the processor. The plurality of electronic circuits may be collectively provided on 1 chip or may be dispersed over a plurality of chips. The plurality of chips may be collectively provided in 1 device or may be distributed among a plurality of devices. The computer system described herein includes a microcontroller having more than 1 processor and more than 1 memory. Therefore, as for the microcontroller, it is constituted by 1 or more electronic circuits including a semiconductor integrated circuit or a large scale integrated circuit.

The imaging unit 1090 is, for example, a cmos (complementary Metal Oxide semiconductor) image sensor attached to the rear of the vehicle 1100, and images the rear of the vehicle 1100. The imaging unit 1090 is not limited to a CMOS image sensor, and may be an image sensor such as a ccd (charge Coupled device) image sensor.

The imaging unit 1090 outputs image data obtained by imaging the rear side of the vehicle 1100 to the control unit 1008 via the in-vehicle network, for example. The imaging unit 1090 is disposed at the center in the left-right direction, for example, at the rear of the vehicle 1100, and images a range that can be visually recognized by a conventional interior mirror, and the electronic mirror system 1010 is used as a rear confirmation mirror similar to the conventional interior mirror. Since the imaging unit 1090 is attached to the rear portion of the vehicle 1100, the rear seat, the pillar (window pillar), and the like are not reflected on the image captured by the imaging unit 1090. The rear of vehicle 1100 may include the rear side of vehicle 1100, and imaging unit 1090 may capture the rear side of vehicle 1100. The imaging unit 1090 can image a range in which the conventional door mirror or exterior mirror can be visually recognized, and the electronic mirror system 1010 can be used as a rear confirmation mirror instead of the conventional door mirror or exterior mirror. The image pickup unit 1009 is attached to the rear portion of the main body 1110, that is, the upper portion of the main body 1110, but the attachment position of the image pickup unit 1090 is an example, and the image pickup unit 1090 may be attached to a position where a desired range can be imaged.

In the display system 1001 according to embodiment 3, an image displayed on the display 1002, in other words, light output from the display surface 1021 of the display 1002 is reflected 1 time by the 2 nd mirror 1003 and the 1 st mirror 1004, respectively. In other words, in the display system 1001, the light output from the display surface 1021 of the display 1002 is reflected 2 times by the optical system L1. Here, the distance (visible distance) from the observer 1200 to the display position of the image visually recognized by the observer 1200 is determined by the optical path length from the display surface 1021 of the display 1002 to the reflection surface 1041 of the 1 st mirror 1004, the focal length of the optical system L1, and the like. In the display system 1001 according to embodiment 3, the light emitted from the display surface 1021 of the display 1002 is reflected 2 times, whereby the size of (the inner space S1 of) the housing 1005 can be reduced while the visible distance to the display position of the image is kept at a desired distance. Accordingly, the size of the housing 1005 can be reduced in the direction in which the observer 1200 views the reflection surface 1041 through the light emitting unit 1058.

In the display system 1001 according to embodiment 3, the interior display unit 1009 is provided integrally with the 2 nd mirror 1003, and is positioned on the reflection surface 1031 of the 2 nd mirror 1003. The 2 nd mirror 1003 has a rectangular plate shape. The interior display unit 1009 is located on an optical path between the display surface 1021 of the display 1002 and the 1 st reflecting mirror 1004.

The interior display portion 1009 displays an interior pattern PA1 (see fig. 35) corresponding to at least a part of an interior in the rear portion of the vehicle 1100. In other words, the interior display unit 1009 displays at least a part of the interior of the vehicle 1100 within the field of view of the 1 st mirror 1004 and outside the field of view of the imaging unit 1090 as the interior pattern PA 1. The display system 1001 is not limited to the configuration in which all of the interior pattern PA1 of the interior display unit 1009 is displayed in the field of view of the 1 st mirror 1004, and may be configured to display at least a part of the interior pattern PA 1. At least a part of the interior trim of the rear portion of the vehicle 1100 includes, for example, 2 pillars 1115 of a rear window of the rear portion of the vehicle 1100 (only one pillar 1115 is visible in fig. 34). The post 1115 here is a window post diagonally behind the rear seat of the vehicle 1100. In the interior display portion 1009, the interior pattern PA1 includes, for example, 2 image portions PA11, PA12, and PA 13. The 2 image portions PA11 are respectively in one-to-one correspondence with the 2 pillars 1115 that are spaced apart from each other in the left-right position of the vehicle 1100. The image portion PA12 corresponds to the rear portion of the ceiling portion 1101 (see fig. 33) coupled to the upper ends of the 2 pillars 1115 of the vehicle 1100. Image portion PA13 corresponds to a portion coupled to the lower ends of 2 pillars 1115 of vehicle 1100. The interior pattern PA1 is not limited to the example of fig. 35, and may include at least 2 image portions PA11 corresponding one-to-one to 2 pillars 1115, respectively, for example. The thickness of the image portion PA11 of the pillar 1115 may vary according to the model of the vehicle 1100, or may appear thinner than the pillar 1115 of the vehicle 1100. In addition, a line corresponding to the electric heating wire of the rear window may be drawn in the region corresponding to the rear window.

In the display system 1001, the light reflected by the 1 st mirror 1004 is made incident on the eyes 1201 of the observer 1200 as light overlapping with the interior pattern PA1, and the image and the interior pattern PA1 are displayed.

In the display system 1001, the interior pattern PA1 included in the interior display unit 1009 is drawn on the reflection surface 1031 of the 2 nd mirror 1003. Here, the interior pattern PA1 is formed by a printing technique. The interior pattern PA1 may be, for example, a translucent printed film, or may be printed in a pattern that looks translucent by a fine dot pattern of water beads.

[ actions ]

The following describes operations of the display system 1001 according to embodiment 3 and the electronic mirror system 1010 including the display system 1001.

For example, when electric power is supplied to the electronic mirror system 1010 from a battery of the vehicle 1100 and a Control signal for starting the operation of the electronic mirror system 1010 is input from an ecu (electronic Control unit) provided in the vehicle 1100, the electronic mirror system 1010 starts to operate.

For example, when a control signal for starting the operation of control unit 1008 is input from the ECU of vehicle 1100, control unit 1008 causes image pickup unit 1090 to pick up an image of the rear side of vehicle 1100 at a predetermined frame rate, and obtains image data of the picked-up image from image pickup unit 1090.

When image data of a captured image is input from the imaging unit 1090, the control unit 1008 creates an image based on the captured image and causes the display surface 1021 of the display 1002 to display the image.

When an image is displayed on the display surface 1021 of the display 1002, light forming the image is emitted to the reflection surface 1031 of the 2 nd mirror 1003. The reflection surface 1031 of the 2 nd mirror 1003 reflects light from the display 1002 toward the 1 st mirror 1004. The 1 st mirror 1004 reflects the enlarged image in which the image of the display surface 1021 is enlarged. Accordingly, the observer 1200 can see the image enlarged by the reflecting surface 1041, and can confirm the situation behind the vehicle 1100 by seeing the image enlarged by the reflecting surface 1041. In the display system 1001, the light reflected by the reflection surface 1041 of the 1 st mirror 1004 is emitted to the outside from the emission portion 1058 of the housing 1005. The light emitting unit 1058 is not limited to a transparent plate or an object such as a liquid crystal mirror, and may be an opening 1521 provided in the housing 1005.

[ advantages ]

The display system 1001 according to embodiment 3 includes a display 1002, a2 nd mirror 1003, and a1 st mirror 1004, and is configured to display an image when light reflected by the 1 st mirror 1004 is incident on an eye 1201 of an observer 1200. Further, since the display system 1001 further includes the interior display portion 1009 provided integrally with the 2 nd mirror 1003, the observer 1200 viewing the 1 st mirror 1004 can see that the image P1 (see fig. 36A) displayed on the display surface 1021 overlaps the interior pattern PA1 (see fig. 35) displayed by the interior display portion 1009 (see fig. 36B). Therefore, in the display system 1001, there is an advantage that the observer 1200 can easily grasp the distance to another vehicle or the like behind the vehicle 1100, compared to a case where the observer directly views a display device that displays the video signal output from the imaging unit 1090 as a video.

In the display system 1001, since the interior display portion 1009 is provided integrally with the 2 nd mirror 1003, the optical path length from the interior display portion 1009 to the eye 1201 is shorter than the optical path length from the display 1002 to the eye 1201 of the observer 1200. Therefore, as shown in fig. 36B, the observer 1200 can visually recognize the interior pattern PA1 (virtual image) on the front side of the image P1 (virtual image) behind the vehicle 1100 displayed on the display 1002. Accordingly, the positional relationship between the interior pattern PA1 and the rearward image P1 is close to the actual positional relationship, and the observer 1200 can be less likely to feel discomfort in the rearward view.

[ modification 1]

Next, a display system 1001a according to modification 1 of embodiment 3 will be described with reference to fig. 37.

The display system 1001a according to modification 1 of embodiment 3 is different from the display system 1001 according to embodiment 3 in that an interior display unit 1009a is provided instead of the interior display unit 1009 of the display system 1001 according to embodiment 3. In other words, the interior display portion 1009 in which the interior pattern PA1 is formed by printing as described in embodiment 3 may be used as a configuration for displaying an interior, or the interior display portion 1009a in which the interior pattern PA2 is displayed by a liquid crystal display or the like described in detail below may be used. In the display system 1001a according to modification 1 of embodiment 3, the same components as those of the display system 1001 according to embodiment 3 are given the same reference numerals, and description thereof is omitted.

The interior display portion 1009a is a2 nd display element capable of displaying the interior pattern PA2, and is provided separately from the display 1002 (hereinafter referred to as the 1 st display element 1002). The interior display portion 1009a is provided integrally with the 2 nd mirror 1003, and is positioned on the reflection surface 1031 of the 2 nd mirror 1003. The 2 nd display element of the interior display portion 1009 is, for example, a liquid crystal display. The interior pattern PA2 includes, as an example, 2 image portions PA21, PA22, and PA 23. The 2 image portions PA21 are respectively in one-to-one correspondence with the 2 pillars 1115 that are spaced apart from each other in the left-right position of the vehicle 1100. Image portion PA22 corresponds to the rear portion of ceiling portion 1101 coupled to the upper ends of 2 pillars 1115 of vehicle 1100. Image portion PA23 corresponds to a portion coupled to the lower ends of 2 pillars 1115 of vehicle 1100.

The display system 1001a according to modification 1 of embodiment 3 includes a control unit 1008a instead of the control unit 1008 in embodiment 3. The controller 1008a is electrically connected to the 1 st display element 1002 and the 2 nd display element. The controller 1008a controls the 1 st display element 1002, similarly to the controller 1008 of the display system 1001 according to embodiment 3.

In the display system 1001a, the observer 1200 who sees the 1 st mirror 1004 is seen as an image P1 (see fig. 38A) displayed on the display surface 1021 and an image (hereinafter also referred to as a reflected image) P2 (see fig. 38C) reflected by the 1 st mirror 1004 from the interior pattern PA2 (see fig. 38B) displayed on the interior display portion 1009 a. In the reflected image P2, an image P1 appears to overlap with the interior pattern PA 2. In other words, since the display system 1001a includes the interior display unit 1009a provided integrally with the 2 nd mirror 1003, the observer 1200 viewing the 1 st mirror 1004 can see that the image P1 (see fig. 38A) displayed on the display surface 1021 overlaps the interior pattern PA2 (see fig. 38B) displayed on the interior display unit 1009a (see fig. 38C). Therefore, in the display system 1001a, the observer 1200 can easily grasp the distance to another vehicle or the like behind the vehicle 1100, which is an advantage compared to the case where the observer directly views the display device that displays the video signal output from the imaging unit 1090 as a video. In fig. 38A to 38C, as in embodiment 3, the observer 1200 can visually recognize the interior pattern PA2 (virtual image) on the front side of the image P1 (virtual image) behind the vehicle 1100 displayed on the display 1002. Accordingly, the positional relationship between the interior pattern PA2 and the rearward image P1 is close to the actual positional relationship, and therefore, the observer 1200 can be less likely to feel discomfort in the rearward view.

The display system 1001a further includes a switch SW 1. Switch SW1 is electrically connected to control unit 1008 a. The switch SW1 is disposed on, for example, the rear wall 1052 of the housing 1005 and can be operated by the observer 1200 or the like. The controller 1008a can switch between the display and non-display of the interior pattern PA2 of the 2 nd display element by operating the switch SW 1. Therefore, the display system 1001a allows the observer 1200 to switch between the display and the non-display of the interior pattern PA2 by operating the switch SW 1.

In the case where the 2 nd display element displays the interior pattern PA2, the observer 1200 can see that the image P1 overlaps with the interior pattern PA2 as in fig. 38C, for example. In the case where the 2 nd display element does not display the interior pattern PA2, the observer 1200 can see the image of fig. 38A reflected by the 1 st mirror 1004, for example.

In display system 1001a, control unit 1008a can obtain vehicle information about vehicle 1100. The vehicle information may include information on other rear vehicles in addition to the information on the vehicle 1100 of the own vehicle. The information of the host vehicle is, for example, vehicle speed information, lane departure information, and vehicle state information, and the information of the rear vehicle is, for example, warning information indicating an approach. The controller 1008a causes the interior display unit 1009a to display at least one of the interior pattern PA2 and the vehicle information by operating the switch SW 1. Fig. 39 shows an example of a reflected image P2 that the observer 1200 sees when the interior display unit 1009a displays both the interior pattern PA2 and the vehicle information.

As shown in fig. 40, display system 1001a displays an image (composite image) P11 obtained by combining captured images output from imaging unit 1090 (1 st camera) that captures the rear of vehicle 1100, a2 nd camera that captures the right rear of vehicle 1100, and a3 rd camera that captures the left rear of vehicle 1100, on top of an interior pattern PA3 corresponding to a part of the interior of vehicle 1100. Fig. 40 shows a reflection image P2 of the 1 st mirror 1004 when a composite image is displayed on the display surface 1021 of the display 1002 and the interior display portion 1009a displays the interior pattern PA 3. The interior pattern PA3 corresponds to a wide range of interior in the vehicle 1100 than the interior pattern PA 2. The interior trim pattern PA3 includes, in addition to the image portion PA31 corresponding to the pillar 1115 of the rear window, image portions PA34, PA35 corresponding to the pillars 1113, 1114 (see fig. 34) of the side window, and image portions PA36, PA37, PA38 corresponding to the rear seat.

Here, the video displayed on the display 1002 is a synthesized video, and a video in the direction directly behind the vehicle 1100, a video in the rear right of the vehicle 1100, and a video in the rear left of the vehicle 1100 are synthesized. The interior of the rear portion of the vehicle 1100 is the interior of the rear portion as viewed from the instrument panel 1108 of the vehicle 1100.

[ modification 2]

Next, a display system 1001b according to modification 2 of embodiment 3 will be described with reference to fig. 41.

The display system 1001b according to modification 2 of embodiment 3 is different from the display system 1001a according to modification 1 of embodiment 3 in that the optical system L1b includes an emission unit 1058b in addition to the 2 nd mirror 1003 and the 1 st mirror 1004, and light from the display surface 1021 of the display 1002 is reflected 3 times by the optical system L1b and emitted from the emission unit 1058 b. In the display system 1001b according to modification 2 of embodiment 3, the same components as those in the display system 1001a according to modification 1 of embodiment 3 are given the same reference numerals, and description thereof is omitted.

The display system 1001b includes an emission unit 1058b made of a half mirror instead of the emission unit 1058 of the display system 1001 a. The emission portion 1058b has a function of transmitting a part of incident light and reflecting another part of the incident light. The output unit 1058b is formed of a flat plate-like beam splitter having a light transmittance and a light reflectance of about 50%.

In the display system 1001b, the 2 nd mirror 1003 is provided to reflect light from the display 1002 toward the light emitting unit 1058 b.

The light emitting unit 1058b reflects the light emitted from the display 1002 and reflected by the 2 nd mirror 1003 toward the 1 st mirror 1004 and transmits the light reflected by the 1 st mirror 1004. The emission portion 1058b is disposed on the reflection surface 1041 side of the 1 st mirror 1004 so as to be separated from the 1 st mirror 1004. The emission part 1058b is arranged so as to be inclined with respect to a plane orthogonal to the direction in which the 1 st mirror 1004 and the emission part 1058b are arranged, such that the distance between the 1 st mirror 1004 and the upper end of the emission part 1058b is shorter than the distance between the 1 st mirror 1004 and the lower end of the emission part 1058b in the direction in which the 1 st mirror 1004 and the emission part 1058b are arranged. Therefore, in the output section 1058b, the upper end of the output section 1058b is located on the front side of the lower end of the output section 1058b in the front-rear direction of the vehicle 1100 (see fig. 33).

Similarly to the display system 1001a according to modification 1 of embodiment 3, the display system 1001B according to modification 2 of embodiment 3 includes the interior display portion 1009a provided integrally with the 2 nd mirror 1003, so that the observer 1200 viewing the 1 st mirror 1004 can see the image P1 (see fig. 38A) displayed on the display surface 1021 and the interior pattern PA2 (see fig. 38B) displayed on the interior display portion 1009a overlapping each other (see fig. 38C). Therefore, in the display system 1001, there is an advantage that the observer 1200 can easily grasp the distance to another vehicle or the like behind the vehicle 1100, compared to a case where the observer directly views a display device that displays the video signal output from the imaging unit 1090 as a video. In modification 2 of embodiment 3, as in embodiment 3, the observer 1200 can visually recognize the interior pattern PA2 (virtual image) on the front side of the image P1 (virtual image) behind the vehicle 1100 displayed on the display 1002. Accordingly, the positional relationship between the interior pattern PA2 and the rearward image P1 is close to the actual positional relationship, and the observer 1200 can be less likely to feel discomfort in the rearward view.

Further, since the optical system L1b is used in the display system 1001b according to modification 2 of embodiment 3, the distance from the eyes 1201 of the observer 1200 to the projection position of the virtual image can be extended as compared with the display system 1001a according to modification 1 of embodiment 3.

[ other modifications ]

The above embodiment 3 is merely an example of various embodiments of the present disclosure. Embodiment 3 can be modified in various ways according to design and the like as long as the above-described object can be achieved.

In embodiment 3, the display 1002 is disposed on the lower surface of the upper wall 1053 of the housing 1005, but the display 1002 may be disposed on the upper surface of the lower wall 1054 of the housing 1005, for example, and the layout inside the housing 1005 may be inverted in the vertical direction.

The

interior display portions

1009 and 1009a may be integral with the 2 nd mirror 1003, and may be provided not only directly on the reflecting surface 1031 of the 2 nd mirror 1003 but also indirectly on the reflecting surface 1031 via another member. The other member is a member that transmits visible light.

The interior display unit 1009 of the display system 1001 according to embodiment 3 may be used instead of the interior display unit 1009a of the display system 1001b according to modification 2 of embodiment 3.

In addition, in the display system 1001b according to modification 2 of embodiment 3, the number of mirrors may be increased so as to increase the number of reflections of the optical system Lb 1.

The display 1002 is not limited to a configuration having a liquid crystal panel and a light source device. The display 1002 may be configured to draw an image on a screen by scanning laser light from behind the screen, for example, on a screen of a diffusion transmission type. The display 1002 may be configured to project an image on a diffusion transmission type screen from behind the screen using a projector, for example. The display 1002 may be a self-Light-Emitting display panel including an OLED (Organic Light Emitting Diode) or the like.

In the

display systems

1001, 1001a, and 1001b, the size of the 1 st mirror 1004 may be determined such that the size of a virtual image with respect to the entire image P1 on a virtual plane of a space separated from the observer 1200 is larger than the field of view of the eyes 1201 of the observer 1200 determined by the 1 st mirror 1004. Here, in the display system 1001, the size of the 1 st mirror 1004 is determined such that the outer peripheral line of the field of view of the eyes 1201 of the observer 1200 is located inside the outer peripheral line of the virtual image on the virtual plane. Accordingly, the display system 1001 is configured to change the position of the reflected image P2 displayed as a virtual image in the distant direction as the eye 1201 of the observer 1200 who sees the 1 st mirror 1004 moves.

The

display systems

1001, 1001a, and 1001b may include a lens disposed on an optical path between the display surface 1021 and the 1 st mirror 1004.

The mobile object to which the electronic mirror system 1010 is applied is not limited to the vehicle 1100. For example, the electronic mirror system 1010 can be applied to a mobile body other than the vehicle 1100, such as a two-wheeled vehicle, an electric train, an airplane, a construction machine, and a ship. In short, the mobile body main body is not limited to an automobile vehicle, and may be a body of a mobile body other than the vehicle 1100 such as a two-wheeled vehicle, an electric train, an airplane, a construction machine, and a ship. The electronic mirror system 1010 is not limited to a mobile body, and can be used in, for example, an entertainment facility, a medical apparatus, or the like.

The configuration of the display system 1001 described in embodiment 3 may be a configuration in which the half mirror 113 is interposed in the optical system, similar to the configuration of the display system 100 in embodiment 1, or may be another configuration.

In embodiment 3, the configuration in which the electronic mirror system 1010 is used in place of the vehicle mirror has been described, but the present invention is not limited to this configuration, and a configuration in which the electronic mirror system 1010 is used in place of a door mirror (or a side mirror) may be implemented. In general, the exterior of the vehicle is reflected on the door mirror, not the interior, and therefore, in this case, the display system 1001 includes an exterior display unit for displaying the exterior of the vehicle, instead of the

interior display units

1009 and 1009 a. The exterior display unit displays, as a vehicle exterior, an exterior pattern, for example, a pattern corresponding to a part of the door panel and a part of the outer shape of the pillar. The exterior display unit may be realized by forming an exterior pattern by a printing technique, or may be realized by a display element such as a liquid crystal display.

[ conclusion ]

In the present embodiment, the following configurations are disclosed.

A display system (1001; 1001 a; 1001b) according to claim 1 of the present embodiment includes a display (1002), a2 nd mirror (1003), and a1 st mirror (1004). The display (1002) has a display surface (1021) that displays an image behind the vehicle (1100). The 2 nd mirror (1003) has a planar reflection surface (1031) and directly reflects light emitted from the display (1002). And a1 st mirror (1004) that reflects at least the light reflected by the 2 nd mirror (1003). The display system (1001; 1001 a; 1001b) further comprises an interior display unit (1009; 1009a) or an exterior display unit. The interior display part (1009; 1009a) or the exterior display part is directly or indirectly located on a reflection surface (1031) provided integrally with the 2 nd mirror (1003). An interior display unit (1009) displays an interior pattern (PA 1; PA 2; PA3) corresponding to at least a part of an interior of a rear portion of a vehicle (1100). An exterior display unit that displays an exterior pattern corresponding to at least a part of an exterior of a rear portion of a vehicle (1100). In a display system (1001; 1001 a; 1001b), light reflected by a1 st mirror (1004) is made incident on an eye (1201) of an observer (1200) as light overlapping an interior pattern (PA 1; PA 2; PA3) or an exterior pattern, and an image and the interior pattern (PA 1; PA 2; PA3) or the exterior pattern are displayed.

With the display system (1001; 1001 a; 1001b) according to claim 1 of the present embodiment, it is easy for an observer (1200) who views a displayed image to grasp the distance between the vehicle (1100) and the vehicle behind.

In a display system (1001) according to claim 2 of the present embodiment, according to claim 1, an interior display unit (1009) or an exterior display unit includes an interior pattern (PA1) or an exterior pattern drawn on a reflection surface (1031) of a2 nd mirror (1003).

With the display system (1001) according to claim 2 of the present embodiment, the interior display unit (1009) or the exterior display unit can be realized with a relatively simple configuration.

In the display system (1001 a; 1001b) according to claim 3 of the present embodiment, according to claim 1, the interior display unit (1009a) or the exterior display unit is a2 nd display element capable of displaying the interior pattern (PA 2; PA3) or the exterior pattern, and the 2 nd display element is provided in addition to the 1 st display element formed by the display (1002).

The interior design (PA 2: PA3) or the exterior design can be easily changed by the display system (1001 a; 1001b) according to claim 3 of the present embodiment.

The display system (1001 a; 1001b) according to claim 4 of the present embodiment further includes a control unit (1008a) and a switch (SW1) according to claim 3. And a control unit (1008a) electrically connected to the 1 st display element and the 2 nd display element (interior display unit 1009 a). The switch (SW1) is electrically connected to the control unit (1008 a). The control unit (1008a) switches between display and non-display of the interior pattern (PA 2: PA3) or the exterior pattern in the 2 nd display element (interior display unit 1009a) by operating the switch (SW 1).

In the display system (1001 a; 1001b) according to claim 4 of the present embodiment, the viewer (1200) switches between the display and non-display of the interior pattern (PA 2: PA3) or the exterior pattern by operating the switch (SW 1).

In the display system (1001 a; 1001b) according to claim 5 of the present embodiment, the control unit (1008a) can obtain vehicle information about the vehicle (1100) according to claim 4. The control unit (1008a) causes the 2 nd display element (interior display unit 1009a) to display at least one of the interior pattern (PA 2: PA3) or the exterior pattern and the vehicle information by operating the switch (SW 1).

The display system (1001 a; 1001b) according to claim 5 of the present embodiment can display the vehicle information superimposed on the video.

In the display system (1001; 1001 a; 1001b) according to claim 6 of the present embodiment, the image displayed on the display (1002) is a synthesized image composed of an image in the direction directly behind the vehicle (1100), an image in the right rear of the vehicle (1100), and an image in the left rear of the vehicle (1100) according to any one of the above-described aspects 1 to 5. The interior of the rear part of the vehicle (1100) is an interior of the rear part of the vehicle (1100) when viewed from the dashboard of the vehicle.

The display system (1001; 1001 a; 1001b) according to claim 6 of the present embodiment can display a wide range of images and interior, and enables an observer (1200) who views the displayed images to more easily grasp the distance between the vehicle (1100) and the vehicle behind.

Although the display system according to 1 or more aspects of the present disclosure has been described above according to the embodiments, the present disclosure is not limited to these embodiments. Various modifications made by those skilled in the art to the present embodiment or a combination of components of different embodiments are also included in the scope of 1 or more embodiments of the present disclosure within the scope not departing from the spirit of the present disclosure.

The present disclosure is useful as a display system for displaying an image on a display, and is typified by an electronic mirror mounted on a vehicle or the like.

Description of the symbols

100, 100a, 301, 301a, 301b, 301c, 301d, 301e, 1001 display system

101 output window

101a image

102 obtaining part

103, 302 display

103a display unit

103b No. 3 retardation film

104 optical system

105, 305 frame

111, 304, 304b, 1004 1 st mirror

112, 1003 No. 2 mirror

113, 113a, 113b, 113c, 113d half mirror

121 st phase difference film

121a phase difference layer 1

121b, 123b, 124b, 125b, 126b adhesion layer

122 st support substrate

123 reflective polarizing film

123a reflective polarizing layer

124 No. 2 support substrate

124a support layer 2

125 nd 2 nd phase difference film

125a 2 nd phase difference layer

126 No. 3 support substrate

126a support layer 3

131 emergent light

132 reflected light

133 transmit light

200 image pickup device

300, 400, 1100 vehicle

321, 1021 display surface

303 reflecting mirror

331 st plane 1

332 side 2

341, 341b, 901, 1031 reflecting surface

358, 358a emitting part

306 pick-up head

307 near infrared light source

308, 1008, 1008a control part

309, 1090 image pickup unit

372 supporting member (driving part)

404 in the vehicle

430 driving seat

431 pillow

435 occupant seat

500, 1200 observer

501, 1201 eye

600 passenger

900 mirror parts

905 actuator

1002 display (No. 1 display element)

1009 interior display part

1009a inner decoration display part (No. 2 display element)

1108 instrument panel

A1 light

D1 imaging direction

PA1, PA2, PA3 interior trim pattern

SW1 switch

Claims

1. A display system is provided, which is capable of displaying a plurality of images,

the display system is provided with:

a display configured to emit light corresponding to image information from a display surface;

a half mirror to which the outgoing light is incident, the half mirror reflecting a1 st component of the incident light as reflected light and transmitting a2 nd component different from the 1 st component; and

a1 st mirror having a concave surface on which incident light is reflected so that the reflected light is reflected toward the half mirror,

in the half mirror, a1 st phase difference film for changing a phase of incident light, a1 st support substrate having a light transmitting property, and a reflective polarizing film for reflecting a1 st polarized light component and transmitting a2 nd polarized light component different from the 1 st polarized light component are laminated in this order from an incident side of the emitted light.

2. The display system as set forth in claim 1,

the 1 st retardation film is directly attached to one main surface of the 1 st support substrate,

the reflective polarizing film is directly attached to the other main surface of the 1 st support substrate.

3. The display system as set forth in claim 1,

the half mirror further has a2 nd phase difference film, the 2 nd phase difference film being laminated on a face of the reflection type polarizing film on a side opposite to the 1 st support substrate,

the 2 nd retardation film changes the phase of the 2 nd polarized light component transmitted through the reflective polarizing film.

4. The display system as set forth in claim 1,

the half mirror further has a2 nd support substrate, the 2 nd support substrate being laminated on a face of the reflective polarizing film on a side opposite to the 1 st support substrate, and having light transmittance.

5. The display system as set forth in claim 1,

the half mirror further includes a3 rd supporting substrate, and the 3 rd supporting substrate is laminated on a surface of the 1 st retardation film on a side opposite to the 1 st supporting substrate, and has optical transparency.

6. The display system as set forth in claim 1,

the display system further includes a2 nd mirror, and the 2 nd mirror is different from the 1 st mirror.

7. The display system as set forth in claim 6,

and the 2 nd reflecting mirror reflects the outgoing light toward the half reflecting mirror.

8. The display system as set forth in claim 6,

the 2 nd mirror reflects the reflected light toward the 1 st mirror.

9. The display system as set forth in claim 1,

the image information is information showing an image captured by an image capturing apparatus.

10. The display system of any one of claims 1 to 9,

the display has:

a light feeder which feeds light corresponding to the image information as linearly polarized light; and

and a3 rd retardation film for emitting the linearly polarized light supplied from the light supplier as the emitted light with a changed phase.

11. The display system as set forth in claim 1,

the display system is provided with:

a frame body in which the display, the half mirror, and the 1 st mirror are built; and

a camera disposed on the frame,

the housing has an exit portion for emitting the light reflected by the 1 st mirror,

the light emitted from the emission part is incident on the eyes of an observer, and an image of the rear of the vehicle using the display system is displayed,

the camera shooting direction of the camera faces to the interior of the vehicle.

12. The display system as set forth in claim 11,

the emission direction of the light from the emission part is along the imaging direction of the camera.

13. The display system as set forth in claim 11,

the camera shooting direction of the camera faces to a headrest of a driving seat in the vehicle.

14. The display system as set forth in claim 11,

the camera head has a camera shooting direction facing a passenger seat in the vehicle.

15. The display system as set forth in claim 11,

the camera is positioned around the emitting part.

16. The display system as set forth in claim 15,

the display system further includes a near infrared light source disposed around the emission portion,

and the emergent direction of the near infrared rays from the near infrared ray light source is along the shooting direction of the camera.

17. The display system as set forth in claim 11,

the 1 st reflecting mirror has a function of transmitting near infrared rays and reflecting visible rays,

the camera is built in the housing and is located on the opposite side of the light emitting unit when viewed from the 1 st mirror.

18. The display system as set forth in claim 17,

the display system further includes a near infrared light source disposed at least one of around the emission unit and around the camera,

19. The display system as set forth in claim 11,

the display system is also provided with a near infrared light source which emits near infrared rays along the shooting direction of the camera,

the half mirror has a function of reflecting near infrared rays,

one of the camera and the near-infrared light source is disposed on the light exit side of the housing and at a position facing the half mirror.

20. The display system as set forth in claim 11,

the display system is also provided with a control part which is electrically connected with the display and the camera,

the control unit detects a value or a displacement amount of at least one of a face position, a viewpoint position, and a line-of-sight direction from the image of the observer captured by the camera, and changes at least one of a position and a size of the image based on the value or the displacement amount.

21. The display system as set forth in claim 11,

the control unit detects a viewpoint position of the observer captured by the camera, and generates a warning signal when it is determined that the viewpoint position is displaced from a predetermined window.

22. The display system as set forth in claim 11,

the display system further includes:

a mirror member provided in the housing and having a reflecting surface that reflects visible light;

an actuator that drives the mirror member; and

a control part electrically connected with the display, the camera and the actuating mechanism,

the mirror member is movable between a1 st position and a2 nd position, the 1 st position being a position outside an optical path of the light reflected by the 1 st mirror, the 2 nd position being a position on the optical path that overlaps with the emission portion when viewed from the 1 st mirror,

the control unit detects a distance between the emission unit and the face of the observer based on a distance in the image captured by the camera, and controls the actuator so that the mirror member is positioned at the 1 st position when the distance is longer than a predetermined distance and the mirror member is positioned at the 2 nd position when the distance is shorter than or equal to the predetermined distance,

in the 2 nd position, the reflective surface of the mirror component is on the viewer side.

23. The display system as set forth in claim 11,

the control unit extracts an image of a passenger on a rear seat of the vehicle from the captured image of the camera, and displays the image on the display by superimposing the image on the video.

24. The display system of any one of claims 11 to 21,

the display system further includes:

a drive unit that changes an emission direction of the light from the emission unit by driving the housing; and

a control part electrically connected with the driving part, the display and the camera,

the control unit detects a viewpoint position of the observer based on the image of the observer captured by the camera, and controls the drive unit so that the housing is driven based on the viewpoint position.

25. The display system as set forth in claim 6,

the 2 nd mirror has a planar reflecting surface, the 2 nd mirror is a flat mirror that directly reflects light emitted from the display,

the display system further includes an interior display unit or an exterior display unit, the interior display unit or the exterior display unit being provided integrally with the 2 nd reflecting mirror and being located directly or indirectly on the reflecting surface, the interior display unit displaying an interior pattern corresponding to at least a part of an interior of a rear portion of the vehicle, the exterior display unit displaying an exterior pattern corresponding to at least a part of an exterior of the rear portion of the vehicle,

in the display system, the image and the interior pattern or the exterior pattern are displayed by causing the light reflected by the 1 st mirror to be incident on the eyes of the observer as light overlapping with the interior pattern or the exterior pattern.

26. The display system as set forth in claim 25,

the interior display unit or the exterior display unit includes the interior pattern or the exterior pattern drawn on the reflection surface of the 2 nd mirror.

27. The display system as set forth in claim 25,

the interior display unit or the exterior display unit is a2 nd display element capable of displaying the interior pattern or the exterior pattern, and the 2 nd display element is provided in addition to the 1 st display element formed of the display.

28. The display system as set forth in claim 27,

the display system further includes:

a control unit electrically connected to the 1 st display element and the 2 nd display element; and

a switch electrically connected to the control part,

the control unit switches between display and non-display of the interior design or the exterior design on the 2 nd display element by operating the switch.

29. The display system as set forth in claim 28,

the control unit being capable of obtaining vehicle information relating to the vehicle,

the control unit causes the 2 nd display element to display at least one of the interior design or the exterior design and the vehicle information by operating the switch.

30. The display system of any one of claims 25 to 29,

the image displayed on the display is a synthesized image composed of an image in a direction directly behind the vehicle, an image in a rear right of the vehicle, and an image in a rear left of the vehicle,

the interior of the rear portion of the vehicle is an interior of a rear portion of the vehicle as viewed from an instrument panel of the vehicle.